The February Amazon Web Services Newsletter had some pretty cool applications:

Blogfuel: “Use blogfuel to create a link to an individual item at amazon (using ASIN Search) to illustrate your book review. Or place the code in the sidebar of your blog as a “What I am currently reading feature”. You have control over the width, colour, number of columns, image and text size.”

PocketBooks – Amazon: “Check prices and availability of books at Amazon.com and Amazon.co.uk from your Java enabled phone”

Books of note, from Sybex: Mining Amazon Web Services: Building Applications with the Amazon API and from Dimensions: Google, Amazon, and Beyond: Creating and Consuming Web Services