Note: This plugin seems to be broken. It does not retrieve any information from Amazon when a search by Keyword(s) is performed.
This plugin gives you an easy way to add images and links for Amazon.com products to your posts. If you get an Amazon Associates ID and enter it in the plugin settings, then you earn a referral fee if someone clicks your link, then buys the product. This can be a way to add an image to a post as an ad or to maintain a blog in your sidebar that shows what books you're reading.