If you don't feel like using the review system this may be something you like. Each person can rate once (based on the ip number) and you can later on show the top rated products on for example your main page.
And ajax makes it possible to vote without reloading the page.
If you want an example you can check the site im working on at the moment but I have added some stuff to my list and changed the rating image, it will basically look like new products but with the ratings under the price, heres the link:
Im not sure a support topic is needed but if it is I will make one later.