Friend2Friend
"Friend2Friend is an ambitious project to establish an open source infrastructure of personal data servers. Intended to securely share all kinds* of personal data, these will be
Distributed - Hosted anywhere on the Internet
Available - Online 24/7, to receive/initiate data transactions or to act as an intermediary
Secure - Each has a private key so it can encrypt requests that it makes to friendly servers.
Networked - Each has a list of friend's servers and their public keys"
URL = http://www.altruists.org/projects/ge/ff/
More Information
See our entry on other P2P Exchange Infrastructure Projects