The Dreaded Spam

Guess it's my turn now. As I've seen it happened to some of my flist members, my LJ just got hit by anonymous spammer. Some annoying anon posted a comment on an old entry of mine advertising...get this...furniture?!? Not that I want to get spammed, but couldn't I at least get something interesting? How boring am I? (Don't answer that.) Granted, I was talking about "prettifying" my journal's look & feel in that old entry. So is there some kind of text crawler at work around here sniffing out certain keywords? This is serious. I hope LiveJournal is able to put a stop to this ASAP.

I don't want to disable anonymous commenting because I do have friends visiting my journal who are not on LJ. All I can do at this point is deleting that comment and marking it as spam. I wonder if there's anyway to ban certain IP addresses (I track them in comments) from commenting on my journal. Anyone?