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This is a little more clear when compared to other sites where I use openid to login. for eg (taken via https://www.google.com/accounts/IssuedAuthSubTokens):
www.clickpass.com — Google Contacts [ Revoke Access ]
stackoverflow.com — Sign in using your Google account [ Revoke Access ]
facebook.com — Sign in using your Google account [ Revoke Access ]
grooveshark.com — Sign in using your Google account [ Revoke Access ]