If you use PeerGuardian, hosts at blocked IP address will receive a PUSH request. Of course, those hosts cannot connect to you but any other can. They can simply scan you and connect to from *any other* host. PeerGuardian is snake oil if you see it as a protection device against getting caught by the RIAA or whoever. I doubt that's the purpose of PeerGuardian and don't think they recommend to use for that. It just won't help. It could help against a certain amount of sabotage, corruption and spamming on the network but it doesn't hide you at all. The major flaw of PeerGuardian is that it's working on the wrong layer.