I mentioned that BottomFeeder has wizard support for Amazon RSS, which generated a comment pointing out that Amazon hides its RSS support pretty completely. I recall that it was pretty hard to figure their support out, but I created a wizard screen to hide all of the complexity that Amazon exposes. Here's a shot of the Book search definition screen:

Here's the DVD search definer:

And here's a shot of the CD search definer:

They work pretty well, and they make it easy to deal with Amazon's less than obvious RSS interfaces. But hey - why make your RSS capabilities obvious when you can file for completely bogus patents?