"In a few minutes Facebook will become the biggest example of a social network that allows users to log-in with OpenID credentials granted to them by other companies' websites. Major networks have said for months that their ID could be used as OpenID, but becoming "relying parties" that accepted OpenID from elsewhere was the step everyone was waiting for. The dam has broken."

"Is it true? Did someone just log in as me? I checked the OpenID logs, and sure enough, there was a valid login from an IP address I didn't recognize. He wasn't bluffing. He really did log in as me."

I'll need to look into this now that I'm signed up for the StackOverflow Beta.