I've recently released a new WordPress plugin which retrieves and previews the user's latest Amazon review on their blog. It's something I initially made for my own use, but later decided to make public. It's a simple plugin, with no additional frills included (other Amazon plugins were too complicated for my tastes).
* Retrieves user’s latest review from Amazon.com
* Support for Amazon Associate IDs
* Customizable rating images
* Administration panel
* Widgetized - drag and drop installation.
* K2 Module provided
* Hemingway Block provided
You can find more information at: http://igvita.com/blog/projects/amazon-review-wp
Comments and suggestions are welcome.