First case of this blog being spammed. 78 comments, one or two on almost all entries, all linking back to one of two gambling sites. (Won't give them the satisfaction of naming them.) Deleted all the entries of course but gave up on IP banning once I figured that they were spoofing the IP addresses. Either that or they've got bots running the same script from mutiple servers throughout the world.
Might have to look into upgrading to a more recent version of Movable Type, if it has better spam control/management tools.