GD Star Rating plugin by Milan Petrovic allows you to set up rating and review system for posts, pages and comments in your blog.
A new, version 1.8.5 has been released. The new version has many improvements and changes, updates to T2 templates system, new tags, actions and filters. Thumbs voting rules are finally implemented properly. Also several bugs have been fixed.
Plugin includes advanced settings panels that will allow you to control many aspects of rating. Plugin also supports multi ratings along with thumbs based ratings. Plugin supports use of cache plugins and dynamic loading of data using ajax.
More Info: www.gdstarrating.com