[blergh123]

"Your best course of action is not to build a login dialog at all, but instead rely on authentication from an outside source whenever you can."

What do people use as their outside source for authentication?

[mark-r]

Jeff was a big OpenID proponent while developing StackOverflow, and it looks like he still is. Even if he's recognized the necessity of offering a more common login approach.

[ProAm]

OpenID I presume, or something similar?

[oddevan]

Probably something Oauth-like, say Facebook, Twitter, GitHub, tumblr., Google, Yahoo...