I've was just taking a look around and found what looked to be a pretty decent book on Amazon Hacks
I haven't read the whole thing myself, but just the topics covered:
How to use Amazon.com as a Web surfer, Web site publisher, and software developer. Detailed coverage goes to advanced product search techniques, managing the characteristics associated with your Amazon login, selling through Amazon Auctions and zShops, and the Amazon Web Services (AWS) API for Perl, PHP, and Python.
I figured that between this one and this other book I saw, I'd be in pretty decent shape.