Hadn't heard of it til you brought it up. Did a little looking and got this nice little description...
PeerGuardian is a tiny firewall program especially designed for P2P software users, but also to anyone who is concerned about the investigations that corporations and authorities perform on the internet. PeerGurdian blocks connections for the configured IP ranges and logs the blocked connections. It uses an online IP database for the blocking, but IP ranges can also be configured manually. Pre-cofigured for blocking are RIAA, MPAA and many others.
Looks like some pretty decent CYA software... I just downloaded it, I'm going to check it out, I've been looking for something like this. Not that I do a lot of illegal file sharing, I just don't like the idea of someone having free range to scan or conduct an
investigation on me...