[AndrewDucker]

BrowserID

OpenID

A dedicated account (my preference)

If you require Facebook then you're locking me out when I'm at work.

[saary]

Thanks.

BrowserID is well on our list (Personally I like its approach).

Added a vote for OpenId, and dedicated account.

[dorian-graph]

Nothing wrong with an old fashioned dedicated account. I refuse to use my Facebook login for, well, basically anything that isn't Facebook.

[Bjartr]

+1 for google account, dedicated account, and live account, in that order of preference. Facebook just leaves a bad taste in my mouth.

[StavrosK]

I'll give a +1 on BrowserID, I think it should be used on as much new stuff as possible. I really love it.