What is OpenId?
OpenID is a shared identity service, which allows Internet users to log on to many different web sites using a single digital identity, eliminating the need for a different user name and password for each site. OpenID is a decentralized, free and open standard that lets users control the amount of personal information they provide.
Where can I get an OpenID?
There are thousands of OpenID providers, among whitch is Yahoo (to login in using your yahoo account, please enter me.yahoo.com/messengerID). If you don’t have an OpenID yet, here are a few which are generally recommended by various members of the community.