Okay... I'm not sure if I should admit to knowing this, or post this info in a place where newbies could find it, but if you rlooking for a brute force cracker.. stay the He11 away Morpheus, Kazaa, or any peer to peer for that matter.
Blackcode Ravers will have everything you need in the way of bruteforce... and as for the Win2K backdoor I'd suggest a few places to start your search
System Security Portal and finally
Astalavista
p.s. Danrak... please don't ban me I'm only being helpful :)