OpenID - decentralized single sign-on authentication system

Can't remember your passwords? Tired of filling out registration forms?
OpenID is a safe, faster, and easier way to log in to web sites. more websites started accepting openID to login to their websites.



OpenID is a decentralized single sign-on authentication system for the Internet. The goal of the OpenID initiative is to allow users to log in at websites around the Internet with one ID, instead of having to create multiple unique accounts.



companies getting behind OpenID


You can find more details from below links
http://openid.net/add-openid
http://www.webmonkey.com/tutorial/OpenID_for_Dummies
http://openidexplained.com/

Websites accepting OpenID
http://www.zoho.com/
http://www.wordpress.com/
http://www.blogger.com/