Sajma:
The scheme we recommend (described somewhat at http://top40.one-of-us.org) involves using a non-anonymous trust network to recommend and discuss files.

So there's 2 orthogonal components:
1) legal, non-anonymous, trusted recommendation and discussion:
Much like how open source projects post their public key or the MD5 checksum of files on their site but let you download the file from mirrors or the p2p network.
2) illegal, anonymous file sharing:
Hopefully with the added ability to let you specify the MD5 checksum of the file so that you know that it's really the same file that was highly ranked or recommended.