Ares - can host its own website. Organizes files into music, video, docs, and other.
iMesh - One is the fact that if someone disconnects while you are trying to download a file of their computer, iMesh will either continue to download that file from a different user or finish it the next time the disconnecting user logs on. Also has skins.
Distributed.net - they have projects to break encryption codes, among other highly technical projects.
Carescience - peer-to-peer technology that enables the exchange of information between healthcare organizations by providing highly secure, real-time Internet access to clinical results, patient demographics, medical records and other critical data.
Nuzzly - P2P app that allows one to share source code. Adware.
Freehaven - anonymous publication of documents. Theory only, no software.
