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.
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.
Latest versions also feature charts, admin dashboard and more.
Detailed info: http://wp.gdragon.info/2008/12/24/gd-star-rating-107/