Beyond my expertise, but I think a (cryptographically sound) distributed publishing system would be possible. It looks like Freenet is a project doing something like this, but more as a way to anonymous and decentralized way to publish information. The kind of implementation I'm thinking of would have to allow for updates to propagate, or for pages to be deleted (at least in the sense that you can with Flickr, even though someone else might have made a copy).

http://en.wikipedia.org/wiki/Freenet#Distributed_storage_and...