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Peerguardian doesn't work with BitTorrent because of the way BitTorrent works.
The idea with PeerGuardian is, the RIAA/MPAA/Whoever scans a whole big bunch of IP addresses asking for share lists or searching for particular titles. With most P2P apps, that's how you find out who has what--you run a search, and it queries individual machines. PeerGuardian knows many known IPs that these scans come from, and blocks them.
BitTorrent works differently. There's a public tracker involved, where the IP address of everybody actively downloading or seeding is published. An individual client pulls down the tracker IP list and broadcasts to those known IPs the data ranges it still needs. It receives those broadcasts from others, and replies with whatever data it has inside those ranges.
So the point is, when you're using BitTorrent, your IP is on a public list of people downloading or sharing a particular document. The Bad Guys don't find you with a scan-oriented approach, they just pull down a list of IPs off the tracker. Nothing to block there. So PeerGuardian can't help.
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