Yahoo, which counts its registered users at 248 million worldwide, says that supporting OpenID will mean that OpenID-compatible accounts are available to a total of 368 million Web users. When Yahoo's support of OpenID goes live, starting with a public beta launch on January 30, this will mean that a Yahoo ID can be consolidated into an OpenID account that will be valid at all partner sites.Big Web players like Google and AOL have already begun supporting this open identification standard and Yahoo is the next on the list. I believe that OpenID will have a great future. It's just a matter of time that Google will offer a full support of OpenID. To note that Brad Fitzpatrick, the founder of LiveJournal and creator of OpenID joined Google last year to support the OpenSocial developer initiative.
More OpenID links are available here.