I have installed the AJAX comment system. It has the side effect of requiring javascript being enabled in your browser to submit a comment.
I’ve also re-enabled anonymous comments. Hopefully the javascript will throwoff some of the automated comment spammers.
I’ve seen a press release from Yahoo stating they are implementing an OpenID beta at the end of the month. Hopefully shortly after that there will be a plugin to make using Yahoo accounts to comment here just as easy as using AIM accounts.