Comments have been broken
Rick kindly pointed out that comments on my blog were broken. Totally my fault--I've been working on PyBlosxom on and off and a couple of weeks ago I updated my blog to use the latest version of PyBlosxom in git master and didn't grab the latest comments plugin.
Comments were getting into the moderator queue (I moderate all comments), but when the comments plugin went to send me a notification email, it'd die.
They're working again.