Is there a Cloud Based User Credential Service out There?

Anyone know of a service oriented membership provider / service? I’m looking for a hosted solution that provides user registration and authentication services. Basically I don’t want to deal with managing user credentials for my applications. 开发者_如何转开发I’d rather leave that to a service that specializes in that. Anything like that out there?

Well, you can just use OpenId: http://openid.net/

OpenID or Facebook Connect suitable for your project?