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Later today Facebook will officially become an OpenID relying party. What does that mean? It means that if you wish to register for Facebook using another OpenID provider, you can. Initially the service will not be completely open though. As Facebook will post later today, “To start, new users can now register for Facebook with their Gmail accounts, and existing users can link their Facebook accounts with any OpenID provider to connect with friends and eliminate the need for multiple sign-ins.”
A few weeks ago Facebook officially announced that their OpenID support would go live and today it has become official. The initial concept is to be able to login using your external account and avoid the need to remember multiple passwords and account addresses. While many people simply use an existing email and the same password for practically every account, remember passwords can quickly become annoying.
Read more at the source: http://www.allfacebook.com/2009/05/facebooks-openid-live/