The Register has an interesting interview with a link spammer. It is funny to think that he can make that much money from doing this link spamming, especially since most of the host names do not resolve.
I do have to say that I have been impressed with pLog's comment spam filter. All of the comment spams have been correctly been marked as spam. I am about to have pLog automatically delete these messages, instead of me manually deleting them, since it has not mis-categorized any of them.