OpenID is a decentralized URL based identity system. An OpenID is simply a URL, and all the OpenID specification does is describe a way to securely prove that the user owns that URL.
OpenID will have to co-exist with regular user names and passwords for some time to come in most cases. So as developers we have to come up with good conventions on how to deal with this duality.
Security Assertion Markup Language (SAML) is an XML standard that allows secure web domains to exchange user authentication and authorization data. Using SAML, an online service provider can contact a
I recently made MashedLife.com, the personal single sign-on to any web site, to support iPhone's display. So iPhone users don't need to type in username/passwd to log on to any web site.