Peer Guardian and Peer Blocker. I still have an IRC script to post that link when people asked about it. Biggest P2P smokescreen ever.
I still get people calling me a know-nothing fool for believing that it does nothing more than add a false sense of security. They get angry and offended. I believe it is a knee-jerk reaction to their own realisation that they were taken by the myth that PB/PG2 does something.
Pisses me off no end but nothing I can do about it. I had a brief stint on kat forums and managed to alienate a bunch on there by saying it does nothing at all besides makes it harder to connect to legit users (the number of addresses PB blocks is close to half the addresses on the 'net!)
But anyway.....