buyrun :
http://wordpress.org/extend/plugins/post-star-rating/
http://wordpress.org/extend/plugins/gd-star-rating/
http://wordpress.org/extend/plugins/wp-postratings/
http://wordpress.org/extend/plugins/xavins-review-ratings/
http://wordpress.org/extend/plugins/star-rating-for-reviews/
http://wordpress.org/extend/plugins/five-star-rating/