There's a thing on Amazon that shows "similar" items to your book. In my case, they're generally other "chick lit" books, but if people buy DVDs or CDs with my book, then those end up in the category, too. So if you click it for CDs, it comes up with David Gray, the Dixie Chicks, Eminem and Norah Jones. What does that say about me? (I shouldn't joke, though, as in truth, I've bought two out of four of those! Hint: Not the Dixie Chicks.)