No sooner than Peter Cohen mentions getting more than 11,000 comment spams than I realize that I had been hit. I previously had less than five spam comments. I now had about 50. Ugh.
Luckily, setting WordPress to moderate comments with more than 3 links in it did the trick. Considering the success he had with MT-Blacklist and MovableType, I thought it was time I got WPBlacklist which is the equivalent for WordPress. Installation was quick and easy.
Now I just have to wait and see if it works.
Update: Two spam comments have been caught already. Seems to be working fine.