Well there's a new P2P network called ANts P2P to try which promises:
ANts P2P realizes a third generation P2P net. It protects your privacy while you are connected and makes you not trackable, hiding your identity (ip) and crypting everything you are sending/receiving from others.
Sounds good to me. I don't know how secure this is as I've only just found this but this weekend I'll be giving this ago (and watching Spurs get beat 6-1 naturally) so may know a little more by next week.