I'm sorry to do it, but I had to turn off anonymous comments. I apologise to any legit commenters who normally comment anonymously or with a name/URL (unfortunately, you can't turn off anonymous without also turning off name/URL). I suddenly started getting spam comments, and it reached the point where I was having to spend about 15 minutes every day just deleting spam comments.
So, you'll now need an account with Google, Wordpress, AIM, LiveJournal, TypePad, or OpenID to comment here. I think almost all of my usual commenters have either Google or Wordpress anyway. I'll probably turn anonymous back on during read-a-thons and whatnot to allow easier commenting.