Mojonation and freenet both have the advantage of content being addressed by secure hashes. The only thing that would need to be signed (if you actually implementing signing) are the indexes that list what the hash ids needed to get the packages are.
FOAF updates: Trust rankings are now exported, making the data available to other users and websites. An external FOAF URI has been added, allowing users to link to an additional FOAF file.
Keep up with the latest Advogato features by reading the Advogato status blog.
If you're a C programmer with some spare time, take a look at the mod_virgule project page and help us with one of the tasks on the ToDo list!