Logged in to Movable Type this morning to see that I had been hit with over 100 fresh spam comments. I do have moderation of new comments turned on, so they weren't live and it wasn't too hard to remove them all. Checked MT-Blacklist, only to see that I hadn't turned it on after installing it a couple of weeks or so ago. Whoops.
Guess it is time to look into installing Conversation Killer, which i mentioned a couple of entries ago.