GD Star Rating is post, page and comment rating plugin for WordPress. Plugin supports different image sets, rating moderation, vote rules, time restricted voting, templates, trend calculations, multi ratings, templated rendering, has a widgets build in and extensive shortcode support.
This latest update contains a lot of improvements, bug fixes and few new features. Also, plugin and plugins widget are fully compatible with upcoming WordPress 2.8.0
Detailed info: http://www.gdstarrating.com/2009/04/26/gd-star-rating-122/