There's also a tool to synchronize the bitcoin block-chain over Freenet if you're into that sort of thing: 

freenet:USK@2PktPfXYLYJ4Ra0tOG3aWRbBhPwr~uCbsLN8TMu4s50,BNvgtnRqAliOqfHK4R1QzILri4BI1A7DvUmTI44rHio,AQACAAE/bof/3/