I have to take this opportunity to mention one of the worst implementations of star rating I've seen.
Someone felt that the basic 5 stars wasn't good enough and decided to make a spectrum that reflects the percentage of votes for each rating. The result is a very confusing graphic.
http://www.summize.com/about.html
In _Information Dashboard Design_, Stephen Few mentions the kinds of graphical differentiation our minds can understand at first glance. Comparing several widths spread horizontally isn't one of them.
Sometimes it's better to stick with a widely-used meme that people understand!
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