Author Post Ratings is a WordPress plugin by philip.newcomer that adds a meta box to the post edit screen, allowing you to chose a 1-5 star rating for the post, or to leave it unrated.
The plugin will automatically add the post rating (using stars, and an optional label) to the top or bottom of the post. If you wish, you can disable that functionality altogether and use a shortcode to insert the post rating anywhere in the post you choose.
The plugin supports ratings for posts, pages, and custom post types, all of which can be individually enabled or disabled in the plugin settings. It is also fully internationalized.
Download: http://wordpress.org/extend/plugins/author-post-ratings/
