myscan SYN-FIN Scan
Tell me about Port Scanning Port Scanning FAQ - dslreports.com

If you use Google to search for fin scan, you'll probably find heaps of info!!

Do you use PeerGuardian? It's a free IP filter, to give you a bit of extra security
Phoenix Labs » PeerGuardian 2

PeerGuardian 2:Manual - Phoenix Labs Wiki

PeerGuadian 2 for Windows Vista beta released - Phoenix Labs