I have yet to find a peer-to-peer file storage system.
You’d think that with all the p2p and cloud services out there, there’d be a way of dropping files into a virtual folder and having them show up around the network (encrypted, of course) – replicated on some kinda of RAID-over-WAN methodology.
I’m thinking Cryptonomicon’s data haven, but done on the cheap (and not in a dedicated place like the Sultanate of Kinakuta).
I’d use it if it were built.