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Check out Mozilla Persona (used to be called BrowserID). https://login.persona.org/about
Yes, I remember that. Ugly solution that didn't expose a UI for sites that didn't support it and still had plain username/password forms. So it's completely impossible to bootstrap this by making some of the features useful to browser users before it was widespread. Needed a js library because it worked at the wrong level of abstraction and put browserid.org in the middle of the transaction for no sensible reason (we…
It is useful to browser users today. You don't have to remember a new password for each site or become less secure by giving the same password out to multiple sites. I'm going to use it on the next site I build.