As I've mentioned, I'm a software developer and happen to be in the amazon.com developer program. If you check out
http://www.klipschcorner.com/ShopAmazon.aspx you can see a basic amazon search/display that I did on KlipschCorner. I'm wondering if it'd be worth it to do my own Amazon sales rankings site, to see if my numbers match up with theirs, or provide different statistics etc?