I’ve been hacked!
Looks like iskorpitx got me. Luckily, it only affects my custom theme files (so far), so I’ve had to switch back to the default. I’ll try to fix it tonight (as well as upgrade to the newest release of wordpress).
UPDATE: Okay, I restored the hacked files, so the old theme is back. I really need to update this theme as the fixed width columns get annoying after a few hundred readings, but you know that already ;-). Off to update to the latest wordpress now.