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, has a widgets build in and shortcode support.
This latest version support multiple rating sets, rss integration and contains many more updates and fixes.
Also, there are more then 10 admin panels for detailed control: votes log, users log, settings, IP filters, export and import, tools and many more.
Detailed info: http://www.gdstarrating.com/2009/02/09/gd-star-rating-112/