Well, I've jumped on the bandwagon. You can now comment using your OpenID instead of specifying a username, password and URI. Just enter your OpenID URI and post your comment. Your nickname and email will be obtained from your SREG data saved on your OpenID server.
Unfortunately, as a side effect of this, I've had to temporarily disable AJAX commenting. I'll fix this one day ;-)
Oh yes, OpenID comments are automatically approved too and will be until spammers start using OpenID.