I'm not sure why this plugin has received such a low overall rating. It very simply grabs *almost any* Amazon art and via a sidebar widget displays the art, linked to the Amazon page, with space for your Amazon Associate ID for those who wish to collect infinitesimal particles of revenue and examine them with a scanning electron microscope.
As delivered it crams all the art together and doesn't provide any display formatting. But the code it generates has a CSS tag, so it's a simple matter to add a class to your CSS and dress it up however you wish. It's simple, but it's definitely 4-star material.