They do different things (federated login vs. access authorization) so focus on which you need most. Note that they are being combined, so hopefully the choice

They do different things (federated login vs. access authorization) so focus on which you need most. Note that they are being combined, so hopefully the choice won't be necessary for too long: http://step2.googlecode.com/svn/spec/openid_oauth_extension/latest/openid_oauth_extension.html http://step2.googlecode.com/svn/spec/openid_oauth_extension/...