there is no real anonymity. encryption means little when it's part of a public program that anyone can use. ip blockers are meaningless window dressing. if someone can connect to you, you are not anonymous, no matter what you believe. you have an ip address, and it is available to someone

you can bounce off proxies, but they just slow you down, and aren't yet practical for p2p. wait till everyone has 10MB connections(if that ever happens) then anonymity will become practical. at this point, all you have available are toys, most of them useless