I made a change to the settings for commenting on this blog. I had an option checked off to required users to be logged in before they could comment. I’ve turned that off — you will have to provide a name and email address, and the first comment you make with a particular address will be held for moderation. But after that they’ll go up right away.
Thanks to Mr. Darius for pointing this out. I think it’s been like this since I moved over from hosted WP, which was not my intention.