We've (2 of us) been thinking about a very related thing:
- Public, non-anonymous, disucssion, ratings, top 40
done through http://one-of-us.org
- File sharing anonymous, non-secure
done through Gnutella, but we need to specify the file somehow
(like a hash.)

- notes: http://top40.one-of-us.org.
- discussion: http://one-of-us.org (search for gnutella)
Please consider checking it out and commenting on it.
I'll continue to monitor this discussion.

Tom.