In a nutshell, peer to peer applications would be built against a framework supporting plug-ins for arbitrary network transport schemes, authentication and signing schemes, and peer discovery schemes.
With this arrangement, it would be possible to configure the components in an arbitrary fashion in order to use the same software to accomplish many different goals:
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.
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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!