A couple weeks ago I logged out of a site that I wasn't expecting to use again, and also revoked Google's OpenID authorization (just being tidy). Yesterday I followed a link from chat to that site and it auto-logged me in (no prompt, no password challenge, and apparently approval from Google?). This isn't a complaint, but I am puzzled by what happened.
What is logging out supposed to mean, with respect to future visits to that site? I expected to come in as a not-logged-in user.
(All of this was in Firefox, but on two different machines.)