[Kilimanjaro]

Somebody said it days ago, we should use our email address as openID and every big email provider should comply with openid standards. Problem solved.

[Kilimanjaro]

In the case of google and stackoverflow, instead of using this:

http://www.google.com/accounts/o8/id

or http://www.google.com/profile/kilimanjaro

which I never remember, how about just providing

[e-mail] and let gmail.com/openid/username do the magic?

Never put the burden on the user...