Well, the last two weeks I have been innundated with spam. It sucks. Now it seems a little more under control. Check out the RBL blocks that happened today HERE. I use procmail and BSpam to filter the stuff that gets through the RBLs. BSpam is cool because it looks through the body of the messages. If you don't have procmail running on your server and still want to take advantage of the Bayesian filtering of email then you can try out the POPFile.