Premium
WPReviewSite
WP Review Site turns WordPress into a powerful review site engine, allowing you to easily create niche review sites on virtually anything
WP Review stuff
Review stuff is a plugin that adds a review process to post editing that includes a ranking, link, and spoiler warning. It was written with movies in mind, but was purposely kept vague enough to be used for pretty much anything.
Post Ratings
This adds a Ajax powered rating system add the bottom of each post, allowing each user to have there say on how good your post is.
GD star rating
GD Star Rating plugin allows you to set up rating and review system for posts, pages and comments in your blog.
Now Reading
is another book review and commentary Plugin which incorporates data from Amazon.com.