UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM N-Q

QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED
MANAGEMENT INVESTMENT COMPANY
   
Investment Company Act file number:      
     811-06721
 
 
BlackRock Insured Municipal 2008 Term Trust, Inc.

(Exact name of registrant as specified in charter)
   
100 Bellevue Parkway, Wilmington, DE 
19809 


(Address of principal executive offices) 
(Zip code) 

Robert S. Kapito, President
BlackRock Insured Municipal 2008 Term Trust, Inc.
40 East 52nd Street, New York, NY 10022
(Name and address of agent for service)
     
Registrant's telephone number, including area code:        888-825-2257
   
Date of fiscal year end:         December 31, 2005 
 
Date of reporting period:      September 30, 2005
 


Item 1. Schedule of Investments.

The Registrant’s unaudited schedule of investments as of the close of the reporting period pursuant to Rule 30b1-5 under the Investment Company Act of 1940 is as follows:

PORTFOLIO OF INVESTMENTS (unaudited)
SEPTEMBER 30, 2005

BlackRock Insured Municipal 2008 Term Trust (BRM)

      Principal                
        Amount           Option Call    
    Rating1       (000)   Description       Provisions2       Value  

          LONG-TERM INVESTMENTS-135.2%            
            Alabama—2.1%            
    AAA   $ 2,410   Auburn Univ., 5.00%, 4/01/09, AMBAC       No Opt. Call   $    2,550,479  
    AAA   6,555   Birmingham Jefferson Civic Ctr. Auth., Ser. A, 4.25%, 1/01/09, FSA       No Opt. Call   6,760,827  

                        9,311,306  

            Alaska—0.9%            
    AAA   4,000   Anchorage, GO, Ser. B, 3.75%, 7/01/09, MBIA       No Opt. Call   4,068,320  

            Arizona—2.1%            
    AAA   4,000   Chandler, GO, Zero Coupon, 7/01/08, FGIC       No Opt. Call   3,648,160  
    AAA   1,000   Phoenix Str. & Hwy., 4.25%, 7/01/09, FGIC       No Opt. Call   1,035,970  
    AAA   4,200   Pima Cnty. Str. & Hwy., 4.125%, 7/01/09, FGIC       07/08 @ 101   4,332,720  

                        9,016,850  

            California—2.3%            
            Dept. of Wtr. Res. Pwr. Sply. Rev.,            
    AAA   5,000       Ser. A, 3.125%, 5/01/08, FSA       No Opt. Call   5,014,050  
    AAA   5,000       Ser. A, 3.375%, 5/01/09, MBIA       No Opt. Call   5,041,000  

                        10,055,050  

            Colorado—2.5%            
    AAA   2,000   E-470 Pub. Hwy. Auth., Ser. B, Zero Coupon, 9/01/11, MBIA       No Opt. Call   1,593,940  
    AAA   1,000   El Paso Cnty., COP, Detention Fac. Proj., Ser. B, 3.20%, 12/01/08, AMBAC       No Opt. Call   998,780  
    AAA   6,965   Regl. Transp. Dist., COP, Transp. Vehicles Proj., Ser. A, 5.00%, 6/01/08, MBIA       06/07 @ 101   7,241,719  
    AAA   1,000   Thornton, COP, 3.25%, 12/01/08, AMBAC       No Opt. Call   1,000,270  

                        10,834,709  

            Delaware—0.2%            
    AAA   650   Delaware River & Bay Auth., 3.25%, 1/01/09, MBIA       No Opt. Call   650,176  

            District of Columbia—3.1%            
            Dist. of Columbia, GO,            
    AAA   195 3     Ser. B, 5.50%, 6/01/09, FSA       ETM   210,908  
    AAA   2,605       Ser. B, 5.50%, 6/01/09, FSA       No Opt. Call   2,798,864  
    AAA   10,000       Ser. B-1, 5.50%, 6/01/08, AMBAC       No Opt. Call   10,585,900  

                        13,595,672  

            Florida—4.7%            
    AAA   2,280   Broward Cnty. Sch. Brd., COP, Ser. B, 4.25%, 7/01/09, FSA       No Opt. Call   2,361,191  
    AAA   13,890   Dept. of Env. Protection Presvtn., Ser. B, 5.00%, 7/01/09, MBIA       No Opt. Call   14,763,820  
    AAA   1,300   Palm Beach, Restoration Proj., Ser. A, 5.00%, 1/01/09, FSA       No Opt. Call   1,373,437  
    AAA   2,080   Tampa Wtr. & Swr., 5.50%, 10/01/08, FSA       No Opt. Call   2,219,609  

                        20,718,057  

            Georgia—5.9%            
    AAA   5,000   Georgia, GO, Ser. E, 5.25%, 2/01/10       No Opt. Call   5,402,050  
    AAA   20,000   Monroe Cnty., PCR, Pwr. Co. Plant Vogtle Proj., 4.20%, 1/01/12, AMBAC       No Opt. Call   20,432,000  

                        25,834,050  

            Hawaii—3.8%            
            Hawaii, GO,            
    AAA   6,510       Ser. CY, 4.00%, 2/01/09, FSA       No Opt. Call   6,668,518  
    AAA   8,045       Ser. CZ, 3.25%, 7/01/09, FSA       No Opt. Call   8,053,206  
    AAA   1,880   Honolulu City & Cnty., Ser. A, 5.00%, 3/01/09, MBIA       No Opt. Call   1,987,066  

                        16,708,790  

            Illinois—14.4%            
    AAA   2,930   Chicago, Ser. A, 5.00%, 1/01/09, AMBAC       No Opt. Call   3,085,349  
            Chicago Park Dist., Pkg. Rev., GO,            
    AAA   3,290       Ser. A, 3.00%, 1/01/08, FGIC       No Opt. Call   3,276,511  
    AAA   1,750       Ser. A, 3.50%, 1/01/09, FGIC       No Opt. Call   1,762,757  
    AAA   1,000       Ser. C, 3.00%, 1/01/09, AMBAC       No Opt. Call   990,210  
    AAA   3,105 3      Chicago Pub. Bldg., Ser. A, Zero Coupon, 1/01/07, MBIA       ETM   2,989,618  
 

1


BlackRock Insured Municipal 2008 Term Trust (BRM) (continued)

      Principal                
        Amount           Option Call    
    Rating1       (000)       Description       Provisions2       Value  

          Illinois—(continued)            
            Cook Cnty. High Sch.,            
    AAA   $ 2,000       Arlington Heights Proj., 4.50%, 12/01/08, FSA       No Opt. Call   $    2,074,940  
    AAA   1,175 3     J. Sterling Morton Twnshp. Proj., Zero Coupon, 12/01/09, FGIC       ETM   1,019,724  
    AAA   4,805       J. Sterling Morton Twnshp. Proj., Zero Coupon, 12/01/09, FGIC       No Opt. Call   4,153,010  
    AAA   13,000   Dev. Fin. Auth., Gas Sply., 3.05%, 2/01/33, AMBAC       No Opt. Call   12,909,130  
    AAA   8,985   Du Page Cnty. Forest Presvtn. Dist., Zero Coupon, 11/01/08       No Opt. Call   8,098,450  
            Illinois, GO, Ser. 1, MBIA,            
    AAA   6,750       3.50%, 7/01/08       No Opt. Call   6,814,867  
    AAA   5,000       Ser. 1, 3.75%, 7/01/09       No Opt. Call   5,088,950  
    AAA   1,455   Kane & Du Page Cntys. Sch. Dist., GO, Ser. A, 3.75%, 1/01/09, FSA       No Opt. Call   1,476,694  
            Met. Pier & Expo. Auth. Ded. St. Tax Rev., McCormick Place Expansion Proj., FGIC,            
    AAA   8,385 3     Zero Coupon, 6/15/08       ETM   7,687,368  
    AAA   215       Zero Coupon, 6/15/08       No Opt. Call   196,695  
    AAA   1,570 3     Ser. A, Zero Coupon, 6/15/08       ETM   1,439,376  

                        63,063,649  

            Kansas—0.2%            
    AAA   1,000   Dev. Fin. Auth. Pub. Wtr. Sply., 4.00%, 4/01/09, AMBAC       No Opt. Call   1,024,880  

            Kentucky—0.8%            
    AAA   3,890   Owensboro Elec. Lt. & Pwr., Ser. B, Zero Coupon, 1/01/09, AMBAC       No Opt. Call   3,472,097  

            Louisiana—1.3%            
    AAA   5,770   Pub. Facs. Auth., Ochsner Clinic Fndtn. Proj., Ser. A, 3.50%, 5/15/09, MBIA       No Opt. Call   5,781,540  

            Michigan—4.8%            
    AAA   6,315   Detroit City Sch. Dist., GO, Sch. Bldg. & Site Impvt. Proj., Ser. A, 4.00%, 5/01/09, FGIC       No Opt. Call   6,481,969  
    AAA   1,665 3 Detroit, GO, 3.50%, 4/01/09, MBIA       ETM   1,683,015  
    AAA   3,000   Michigan Trunk Line, Ser. A, 4.125%, 11/01/08, FSA       No Opt. Call   3,088,500  
    AAA   2,535   Washtenaw Cmnty. Coll., 4.00%, 4/01/09, MBIA       No Opt. Call   2,600,606  
    AAA   2,695   West Ottawa Pub. Sch. Dist., GO, Ser. B, 3.50%, 5/01/09, FGIC       No Opt. Call   2,721,142  
    AAA   2,000   Western Twnshps. Util. Auth. Swr. Disp. Sys., 5.00%, 1/01/09, FGIC       No Opt. Call   2,112,360  
    AAA   2,160   Wyandotte Elec., 6.25%, 10/01/08, MBIA       No Opt. Call   2,249,078  

                        20,936,670  

            Mississippi—0.5%            
    AAA   2,175   De Soto Cnty. Sch. Dist., GO, 3.25%, 2/01/09, FSA       No Opt. Call   2,174,260  

            Nevada—3.1%            
    AAA   6,270   Clark Cnty. Sch. Dist., Ser. A, 4.00%, 6/01/09, FGIC       No Opt. Call   6,428,443  
            Dept. of Bus. & Ind. Las Vegas Monorail Proj., AMBAC,            
    AAA   2,085       Zero Coupon, 1/01/09       No Opt. Call   1,849,207  
    AAA   3,585       Zero Coupon, 1/01/10       No Opt. Call   3,051,194  
    AAA   2,245   Las Vegas Clark Cnty. Library Dist., 4.75%, 2/01/09, FGIC       No Opt. Call   2,349,415  

                        13,678,259  

            New Jersey—1.2%            
    AAA   1,220   Econ. Dev. Auth., Econ. Recovery Fund, Ser. A, 4.50%, 3/15/09, MBIA       No Opt. Call   1,270,911  
            Monmouth Cnty. Impvt. Auth. Gov't. Loan,            
    AAA   1,220       3.10%, 4/15/09, AMBAC       No Opt. Call   1,215,547  
    AAA   1,000       5.00%, 12/01/08, FSA       No Opt. Call   1,056,350  
    AAA   1,750   Transp. Trust Fund Auth. Transp. Sys., Ser. C, 5.25%, 12/15/08, AMBAC       No Opt. Call   1,857,485  

                        5,400,293  

            New Mexico—1.1%            
    AAA   2,030   Farmington Util. Sys., Ser. A, 3.50%, 5/15/09, FSA       No Opt. Call   2,046,423  
    AAA   2,600   Fin. Auth. Pub. Impvt. Proj., Ser. A, 3.80%, 6/01/08, MBIA       No Opt. Call   2,641,990  

                        4,688,413  

            New York—13.2%            
            Env. Fac. Corp., PCR, Ser. D,            
    AAA   1,030       6.50%, 5/15/07       01/05 @ 102   1,044,904  
    AAA   80       6.50%, 11/15/07       01/05 @ 102   81,158  
    AAA   2,000   Erie Cnty. Pub. Impvt., Ser. A, 4.50%, 3/15/09, FGIC       No Opt. Call   2,083,460  
            New York, MBIA,            
    AAA   1,450 3     Ser. E, 6.125%, 8/01/06       ETM   1,488,367  
    AAA   3,550       Ser. E, 6.125%, 8/01/06       No Opt. Call   3,644,536  
    AAA   15,915       GO, Ser. F, 5.25%, 9/15/09       09/08 @ 101   16,964,912  

2


BlackRock Insured Municipal 2008 Term Trust (BRM) (continued)

      Principal                
        Amount           Option Call      
    Rating1       (000)       Description       Provisions2       Value  

          New York—(continued)            
    AAA   $ 4,250   New York City Hlth. & Hosp. Corp. Hlth. Sys. Svcs., Ser. A, 3.50%, 2/15/09, AMBAC       No Opt. Call   $    4,279,410  
            New York City, GO, MBIA,            
    AAA   15,500       Ser. E, 6.20%, 8/01/07       No Opt. Call   16,355,445  
    AAA   5,000 4     Ser. G, 5.75%, 2/01/06       N/A   5,121,650  
    AAA   4,000   Port Auth. of NY & NJ, Ser. 129, 2.875%, 11/01/08, FSA       No Opt. Call   3,977,240  
    AAA   2,715   Thruway Auth. Svc. Contract Rev., Local Hwy. & Brdg. Proj., Ser. A, 5.40%, 1/01/09, MBIA       01/05 @ 102   2,761,264  

                        57,802,346  

            North Carolina—8.1%        
            Eastn. Mun. Pwr. Agcy. Sys. Rev., Ser. B,            
    AAA   13,500       6.125%, 1/01/09, FGIC       No Opt. Call   14,700,555  
    AAA   5,000       7.00%, 1/01/08, CAPMAC       No Opt. Call   5,411,550  
    AAA   14,675       Ser. B, 7.25%, 1/01/07, CAPMAC       No Opt. Call   15,436,192  

                        35,548,297  

            Ohio—0.5%            
    AAA   2,000   Bldg. Auth., Worker's Comp. Facs., Ser. A, 5.00%, 4/01/09, FGIC       No Opt. Call   2,117,260  

            Oregon—2.0%            
            Dept. of Admin. Svcs., FSA,            
    AAA   2,905       COP, 5.00%, 11/01/08       No Opt. Call   3,064,630  
    AAA   2,255       Lottery Rev., Ser. C, 3.125%, 4/01/09       No Opt. Call   2,248,708  
    AAA   1,285   Lane Cnty. Sch. Dist. No. 4, 3.00%, 1/01/09, FSA       No Opt. Call   1,278,678  
    AAA   2,000   Washington & Clackamas Cntys. Sch. Dist., GO, 3.75%, 6/15/08, MBIA       No Opt. Call   2,032,780  

                        8,624,796  

            Pennsylvania—11.5%            
    AAA   1,460   Bensalem Twnshp. Sch. Dist., GO, 3.25%, 8/15/09, FGIC       No Opt. Call   1,462,073  
    AAA   1,500   Bristol Twnshp. Sch. Dist., 4.25%, 2/15/09, FGIC       No Opt. Call   1,549,275  
            Dauphin Cnty. Gen. Auth., HAPSCO-Western PA Hosp. Proj., MBIA,            
    AAA   5,275       Ser. A, 6.25%, 7/01/08       01/05 @ 100   5,306,334  
    AAA   2,725 3     Ser. B, 6.25%, 7/01/08       ETM   2,853,865  
            Dept. of Gen. Svcs., COP, FSA            
    AAA   2,075       4.50%, 5/01/08       No Opt. Call   2,145,737  
    AAA   2,120       4.50%, 11/01/08       No Opt. Call   2,205,669  
    AAA   2,165       4.50%, 5/01/09       No Opt. Call   2,258,506  
    AAA   2,220       4.50%, 11/01/09       No Opt. Call   2,328,447  
    AAA   3,500   Indiana Cnty. Indl. Dev. Auth., PCR, Elec. & Gas Corp. Proj., Ser. A, 6.00%, 6/01/06, MBIA       No Opt. Call   3,569,790  
    AAA   16,250   Lehigh Cnty. Indl. Dev. Auth., PCR, 3.125%, 11/01/08, AMBAC       No Opt. Call   16,256,825  
    AAA   3,175   Philadelphia, GO, 4.10%, 9/15/08, FSA       No Opt. Call   3,262,725  
    AAA   3,125   Pittsburgh Pub. Pkg. Auth. Pkg. Rev., 3.25%, 12/01/08, AMBAC       No Opt. Call   3,133,313  
    AAA   3,955   West Chester Area Sch. Dist., GO, Ser. AA, 3.65%, 1/15/09, MBIA       07/07 @ 100   3,991,505  

                        50,324,064  

            South Carolina—0.9%            
    AAA   2,020   Chester Cnty. Sch. Dist., 3.25%, 2/01/09, FSA       No Opt. Call   2,025,636  
    AAA   1,705   Lexington Cnty. Sch. Dist. 1, COP, 3.50%, 3/01/09, AMBAC       No Opt. Call   1,723,550  

                        3,749,186  

            Tennesee—0.3%            
    AAA   1,000   Clarksville Wtr. Swr. & Gas Rev., 4.30%, 2/01/09, FSA       No Opt. Call   1,034,050  

            Texas—24.4%            
    AAA   5,380   Austin Pub. Impvt., GO, 3.50%, 9/01/08, FSA       No Opt. Call   5,424,331  
            Austin Util. Sys.,            
    AAA   5,000       6.625%, 11/15/08, AMBAC       No Opt. Call   5,493,750  
    AAA   11,515       Ser. A, Zero Coupon, 11/15/08, MBIA       No Opt. Call   10,343,003  
    AAA   5,000       Ser. A, Zero Coupon, 11/15/09, AMBAC       No Opt. Call   4,321,300  
    AAA   5,000       Ser. A, Zero Coupon, 11/15/09, MBIA       No Opt. Call   4,321,300  
            Coppell Indpt. Sch. Dist., MBIA,            
    AAA   1,430 3     6.10%, 8/15/09       ETM   1,571,255  
    AAA   620       6.10%, 8/15/09       02/05 @ 100   626,969  
    AAA   2,500   Dallas Wtr. Wks. & Swr. Sys., 3.50%, 4/01/09, FSA       No Opt. Call   2,519,625  
    AAA   4,390   Houston Indpt. Sch. Dist., Zero Coupon, 8/15/09, AMBAC       No Opt. Call   3,830,846  
    AAA   2,000   Houston Pub. Impvt., Ser. A-1, 5.00%, 3/01/09, MBIA       No Opt. Call   2,109,940  

3


BlackRock Insured Municipal 2008 Term Trust (BRM) (continued)

      Principal                
        Amount           Option Call      
    Rating1       (000)       Description       Provisions2       Value  

          Texas—(continued)            
            Lower Colorado River Auth.,            
    AAA   $ 2,010       3.50%, 5/15/09, MBIA       No Opt. Call   $    2,026,261  
    AAA   2,690       5.25%, 5/15/09, FSA       No Opt. Call   2,870,876  
    AAA   1,650   Lubbock Cnty., 3.50%, 2/15/09, FGIC       No Opt. Call   1,661,418  
            Mun. Pwr. Agcy., AMBAC,       ETM   978,873  
    AAA   1,075 3     Zero Coupon, 9/01/08       ETM   978,873  
    AAA   13,925       Zero Coupon, 9/01/08       No Opt. Call   12,600,454  
    AAA   1,155 3     Zero Coupon, 9/01/09       ETM   1,012,508  
    AAA   15,020       Zero Coupon, 9/01/09       No Opt. Call   13,086,325  
    AAA   1,500   North Texas Tollway Auth., Ser. C, 5.00%, 1/01/09, FSA       No Opt. Call   1,581,900  
            Pub. Fin. Auth.,            
    AAA   2,270       3.50%, 2/01/09, FGIC       No Opt. Call   2,286,957  
    AAA   5,900       Ser. B, 6.25%, 2/01/09, AMBAC       No Opt. Call   6,441,148  
    AAA   6,000 3 San Antonio Elec. & Gas, Ser. B, Zero Coupon, 2/01/10, FGIC       ETM   5,132,820  
            St. Pub. Fin. Auth. Bldg. Rev., Gen Svcs. Comm. Projs., AMBAC,            
    AAA   2,250 4     5.50%, 2/01/08       N/A   2,395,125  
    AAA   750       5.50%, 2/01/09       02/08 @ 101   795,067  
    AAA   9,050   Tarrant Regl. Wtr. Dist. Impvt., 3.50%, 3/01/09, FSA       No Opt. Call   9,119,323  
    AAA   1,825   Williamson Cnty., GO, Ser. B, 5.00%, 2/15/09, FSA       No Opt. Call   1,927,036  
    AAA   2,275   Ysleta Indpt. Sch. Dist., GO, Zero Coupon, 8/15/08       No Opt. Call   2,059,421  

                        106,537,831  

            Utah—3.3%            
            Intermountain Pwr. Agcy. Sply., Ser. B, MBIA,            
    AAA   2,215 3     6.00%, 7/01/07       ETM   2,329,737  
    AAA   1,285       6.00%, 7/01/07       No Opt. Call   1,349,995  
    AAA   10,300 4 Utah, GO, Ser. F, 5.00%, 7/01/07       N/A   10,660,191  

                        14,339,923  

            Washington—10.7%            
    AAA   1,250   Clark Cnty. Pub. Util. Dist. No. 1 Rev., 5.00%, 1/01/09, MBIA       No Opt. Call   1,318,250  
            Hlth. Care Fac. Auth. Catholic Hlth. Initiatives Proj., Ser. A, MBIA,            
    AAA   1,010       5.30%, 12/01/08       No Opt. Call   1,069,711  
    AAA   1,000       5.40%, 12/01/10       06/10 @ 101   1,084,930  
    AAA   3,060   King Cnty. Pub. Transp. Sales Tax, GO, 3.50%, 12/01/08, FSA       No Opt. Call   3,086,347  
    AAA   12,850   King Cnty., GO, Ser. D, 5.55%, 12/01/08, MBIA       12/07 @ 102   13,733,052  
    AAA   2,045   Motor Vehicle Fuel Tax, GO, 4.00%, 7/01/09, MBIA       No Opt. Call   2,097,782  
            Pub. Pwr. Sply.,            
    AAA   11,000       Ser. A, 5.80%, 7/01/07, FSA       No Opt. Call   11,492,690  
    AAA   5,550       Nuclear Proj. No. 3, Zero Coupon, 7/01/07, MBIA       No Opt. Call   5,244,750  
    AAA   2,000       Nuclear Proj. No. 3, Zero Coupon, 7/01/08, MBIA       No Opt. Call   1,819,180  
    AAA   5,710   Seattle Impvt. Ltd. Tax, 4.00%, 7/01/08, FSA       No Opt. Call   5,834,706  

                        46,781,398  

            West Virginia—1.5%            
    AAA   1,550   Econ. Dev. Auth. Correctional Juvenile & Pub. Proj., Ser. A, 4.25%, 6/01/08, MBIA       No Opt. Call   1,592,656  
            Higher Ed. Policy Comm. Rev. St. Coll. Fac. Proj., Ser. A, MBIA,            
    AAA   2,455       5.00%, 4/01/09       No Opt. Call   2,594,788  
    AAA   2,135       5.00%, 4/01/09       No Opt. Call   2,256,567  

                        6,444,011  

            Wisconsin—3.2%            
            Wisconsin, GO,            
    AAA   7,705       Ser. A, 4.00%, 5/01/09, FGIC       No Opt. Call   7,903,481  
    AAA   6,080       Ser. C, 4.00%, 5/01/09, MBIA       No Opt. Call   6,236,621  

                        14,140,102  

            Wyoming—0.6%            
    AAA   1,270   Albany Cnty. Impvts. Statutory Trust, COP, 3.75%, 1/15/09, MBIA       No Opt. Call   1,291,133  
    AAA   1,395   Albany Cnty. Impvts. Statutory Trust, COP, 3.75%, 7/15/09, MBIA       No Opt. Call   1,419,064  

                        2,710,197  

            Total Long-Term Investments (cost $571,040,268)           591,166,502  

 

4


BlackRock Insured Municipal 2008 Term Trust (BRM) (continued)

      Principal                
        Amount           Option Call      
    Rating1       (000)       Description       Provisions2       Value  

          SHORT-TERM INVESTMENTS—25.7%            
            Florida—2.1%            
    A-1+   9,155 5 Pinellas Cnty. Hlth. Fac. Auth., 2.83%, 10/03/05, AMBAC, FRDD       N/A   $     9,155,000  

            Illinois—1.5%            
    A-1+   6,600 5 Joliet Regl. Port Dist. Marine Term. Rev., Exxon Corp. Proj., 2.65%, 10/03/05, FRDD       N/A   6,600,000  

            Kansas—0.8%            
    A-1+   3,455 5 Dept. Transp. Hwy., Ser. B-1, 2.31%, 10/03/05, FRDD       N/A   3,455,000  

            Louisiana—0.4%            
    A-1+   1,600 5 East Baton Rouge Parish Poll. Ctrl. Rev., Exxon Proj., 2.79%, 10/03/05, FRDD       N/A   1,600,000  

            Maryland—0.4%            
    VMIG1   2,000 5 Cmnty. Dev. Admin. Multi-Fam. Hsg., Avalon Lea Apts. Proj., 2.75%, 10/05/05, FRWD       N/A   2,000,000  

            Massachusetts—4.1%            
            St. Hlth. & Edl Fac. Auth. Rev., Harvard Univ. Proj., FRWD,            
    A-1+   12,000 5     Ser. BB, 2.61%, 10/06/05       N/A   12,000,000  
    A-1+   $5,750 5     Ser. R, 2.61%, 10/06/05       N/A   5,750,000  

                        17,750,000  

            Michigan—0.3%              
            Detroit Swr. Disp. Rev.,            
    A-1+   995 5     Ser. A, 2.78%, 10/05/05, MBIA, FRWD       N/A   997,296  
    A-1+   490 5     Rev., Ser. C-1, 2.78%, 10/06/05, FSA, FRWD       N/A   490,000  

                        1,487,296  

            New Jersey—0.2%            
    A-1+   1,055 5 Edl. Fac. Auth., Princeton Univ. Proj., Ser. B, 2.68%, 10/03/05, FRDD       N/A   1,055,000  

            New York—3.1%            
    A-1+   1,700 5 Jay Str. Dev. Corp. Cts. Fac. Lease Rev., Ser. A-2, 2.31%, 10/03/05, FRDD       N/A   1,700,000  
    A-1+   5,000 5 New York City Mun. Wtr. Fin. Auth. Wtr. & Swr. Sys. Rev., Ser. C, 2.33%, 10/03/05, FRDD       N/A   5,000,000  
    A-1+   7,000 5 New York City, GO, Ser. H-7, 2.79%, 10/03/05, FRDD       N/A   7,000,000  

                        13,700,000  

            North Carolina—4.1%            
    A-1+   7,540 5 Buncombe Cnty. Met. Swr. Dist. Swr. Sys. Rev., 2.75%, 10/06/05, XLCA, FRWD       N/A   7,540,000  
    A-1+   10,550 5 Mecklenburg Cnty., Ser. C, 2.73%, 10/06/05, FRWD       N/A   10,550,000  

                        18,090,000  

            Ohio—4.1%            
    VMIG1   7,000 5 Hamilton Cnty. Hosp. Facs., Ser. A, 2.75%, 10/05/05, FRWD       N/A   7,000,000  
    A-1+   500 5 Kent St. Univ. Rev., 2.79%, 10/05/05, MBIA, FRWD       N/A   500,000  
    VMIG1   10,605 5 Univ. of Akron, 2.75%, 10/06/05, FGIC, FRWD       N/A   10,605,000  

                        18,105,000  

            Pennsylvania—1.9%            
    VMIG1   4,200 5 Higher Ed. Facs. Auth. St. Sys. Higher Ed. Proj., Ser. A, 2.76%, 10/06/05, MBIA, FRWD       N/A   4,200,000  
    VMIG1   3,995 5 Higher Ed. Facs. Auth. St. Sys. Higher Ed. Proj., Ser. A, 2.76%, 10/06/05, MBIA, FRWD       N/A   3,995,000  

                        8,195,000  

            Puerto Rico—0.6%            
    A-1   2,500 5 Hwy. & Transp. Auth. Transp. Rev., Ser. A, 2.72%, 10/05/05, AMBAC, FRWD       N/A   2,500,000  

            Tennesee—0.1%            
    VMIG1   275 5 Clarksville Pub. Bldg. Auth., 2.82%, 10/03/05, FRDD       N/A   275,000  

            Washington—0.6%            
    A-1+   2,500 5 Snohomish Cnty. Pub Util. Dist. No.001 Generation Sys. Rev.,            
                Ser. A-1, 2.74%, 10/05/05, FSA, FRWD       N/A   2,500,000  

 

5


BlackRock Insured Municipal 2008 Term Trust (BRM) (continued)

      Shares              
        (000)       Description               Value  

          MONEY MARKET FUND—1.4%            
        6,000   AIM Tax Free Investment Co. Cash Reserve Portfolio           $ 6,000,000  

            Total Short-Term Investments (cost $112,467,296)           112,467,296  

            Total Investments—160.9% (cost $683,507,5646)           $ 703,633,798  
            Other assets in excess of liabilities—1.1%           4,936,948  
            Preferred shares at redemption value, including dividends payable—(62.0)%           $(271,121,339)  

            Net Assets Applicable to Common Shareholders—100%           $ 437,449,407  

 


1   Using the higher of S&P’s, Moody’s or Fitch’s rating.  
2   Date (month/year) and price of the earliest optional call or redemption. There may be other call provisions at varying prices at later dates.  
3   This security is collateralized by U.S. Treasury obligations.  
4   This bond is prerefunded. U.S. government securities, held in escrow, are used to pay interest on this security, as well as retire the bond in full at the date indicated, typically at a premium to par.  
5   For purposes of amortized cost valuation, the maturity date of this instrument is considered to be the earlier of the next date on which the security can be redeemed at par, or the next date on which the rate of interest is adjusted. Rate shown is rate as of September 30, 2005.  
6   Cost for Federal tax purposes is $682,850,577. The net unrealized appreciation on a tax basis is $20,783,221, consisting of $21,656,760 gross unrealized appreciation and $873,539 unrealized depreciation.  
 
    The value (market value plus accrued interest) of securities that are covered by insurance, which ensures the payment of principal and interest, represent approximately 85.6% of the Trust's managed assets. The Trust has the following insurance concentrations:  

AMBAC – 21.7%
CAPMAC – 3.0%
FGIC – 13.5%
FSA – 17.1%
MBIA – 29.2%
XLCA – 1.1%


KEY TO ABBREVIATIONS

AMBAC   American Municipal Bond Assurance Corp.   FRWD   Floating Rate Weekly Demand    
CAPMAC   Capital Markets Assurance Co.   FSA   Financial Security Assurance    
COP   Certificate of Participation   GO   General Obligation    
ETM   Escrowed to Maturity   MBIA   Municipal Bond Insurance Assoc.    
FGIC   Financial Guaranty Insurance Co.   PCR   Pollution Control Revenue    
FRDD   Floating Rate Daily Demand   XLCA   XL Capital Assurance    
               

6


Item 2. Controls and Procedures.

(a) The Registrant's principal executive and principal financial officers have evaluated the Registrant's disclosure controls and procedures within 90 days of this filing and have concluded, as of that date, that the Registrant’s disclosure controls and procedures were reasonably designed to ensure that information required to be disclosed by the Registrant in this Form N-Q was recorded, processed, summarized, and reported within the required time periods and that information to be disclosed by the Registrant in this Form N-Q was accumulated and communicated to the Registrant’s management , including it principle executive and principle financial officers, as appropriate to allow timely decisions regarding required disclosure.

(b) There were no changes in the Registrant's internal control over financial reporting (as defined in Rule 30a-3(d) under the 1940 Act (17 CFR 270.30a -3(d)) that occurred during the registrant's last fiscal quarter that have materially affected, or are reasonably likely to materially affect, the Registrant's internal control over financial reporting.

Item 3. Exhibits.

Separate certifications of the registrant’s principal executive and financial officers pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 are attached as EX-99.CERT.


SIGNATURES

     Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

(Registrant)     BlackRock Insured Municipal 2008 Term Trust, Inc.     

By:      /s/ Henry Gabbay                                                                                                     
Name: Henry Gabbay
Title: Treasurer
Date: November 18, 2005

      Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the Registrant and in the capacities and on the dates indicated.

By:      /s/ Robert S. Kapito                                                                                                 
Name: Robert S. Kapito
Title: Principal Executive Officer
Date: November 18, 2005

By:      /s/ Henry Gabbay                                                                                                     

Name: Henry Gabbay
Title: Principal Financial Officer
Date: November 18, 2005