I just polished off Version 1.1 of the Amazon Showcase WordPress Widget. This version adds some user-requested features and also addresses some compatibility issues.
Amazon Showcase is a WordPress Widget for showcasing items from Amazon. Simply enter the ASIN/ISBN numbers of any products and optionally enter an Associate ID for earning commissions. The product image will be displayed with a link to the product detail page on Amazon.com.
Read more about updated features here: New Version of Amazon Showcase WordPress Widget