Identity
LID
LID is a quite simple, but powerful technology that empowers individuals to keep control over and manage their on-line digital identities. LID uses URLs as identifiers, is fully decentralized and supports multiple underlying protocols such as Open ID, Yadis and PGP/GPG. LID functionality can be easily added to a URL that you own already, such as your blog. It’s also very simple, interoperable, extensible, and secure. (from the LID Wiki )