The reason I chose OpenID was for the convenience it gives users. A lot of people already have a Google or Yahoo account, and they don't want even more passwords to remember.
I agree that OpenId is good for that, which is why it came about anyway. Just that keeping in mind one of the key attributes of bitcoin, makes that sort of a irrelevant consideration if you know what I mean. It's a little like providing condoms dispensers in the toilet for convenience... except the toilet's in a monastery.
If you want anonymity you could create a new account anywhere that offers OpenID accounts, instead of using the same Google account you use everywhere else.
Of course that's what I do... this nick and associated email is basically only used for my non-serious for fun geeky activities, and shared with a few friends just to obfuscate the trail further.
But if enough users want it, maybe I'll add regular username+password login too. My TODO list is getting rather long, though.
What I already have planned for logins is:
1. Being able to associate multiple OpenID identities with your BitMinter account. So if you lose one OpenID you can still log in with another one, provided you registered it with BitMinter first.
2. Logging in with a Facebook account
I like what you've done with the miner Doc, but a (Disregard-My-Privacy)-Facebook-Connect button is one of those things that make me want to click close on a site
Why not do it the way eligius does it? No login, just use the receiving address. Nothing for anybody to steal unless they want to send BTC to some stranger
And you don't even need to worry about user logins, password security and whatever not.
