You can easily add a rating system to your website with JS-Kit. This is a great way to get immediate feedback on your website products, listings or posts from your visitors. Also, if you haven’t heard Google will be displaying Rich Snippets which may include ratings. So, get your ratings now and possibly enhance your listings in a Google Search Result snippet.

From JS-Kit:

The best content on most web sites and blogs gets buried as new content is added. JS-Kit’s Ratings service solves this problem by uncovering and displaying your top content. It lets your visitors rate your merchandise items, services, pictures, blog entries, or any other objects on your site.

The service can be used in two modes, either as a 5-star rating widget or a thumb-up/-down widget and is incredibly easy to install on any static or dynamic web page.

Link:
http://js-kit.com/ratings/

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