From the usability perpective, it is perfect to authenticate with google at all type of pages with my Google OpenID (for example on stackexchange).
But I do not really know what happens when I do so. Especially I would like to get a list for all the pages where I authenticated myself with OpenID with google.
Does such a list exist? Or do I get something wrong with the concept of OpenID. Is it possible to detract the authentication for specific sites?