Everyone who's sick of this spam, hit their posts with a one-star rating, take a few moments to check their other posts, and hand out a few more single stars. (Hand out a lot, if you have the time.)
If you also copy & post this message (new post, not a reply to the spam) you can help spread the word to other people on other boards.
Dozens of people are doing this already, and it's consuming more and more of the spammer's time just to keep up. With a few hundred dedicated spam troopers, they'll be outgunned, and if nobody sees the crap they get no money.