While googling for the latest on crypto export law, I came across Nullsoft's WASTE living on at SourceForge.  FYI, WASTE is open source small P2P network software supporting IM, group chat, file browsing/searching, and file transfer.  It was released by Nullsoft and then removed by AOL, its parent company, in matter of hours.  WASTE is now up to version 1.1.  Go check out WASTE at SourceForge.