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Amazon's improved rating display
Amazon recently unveiled a better way to display customer reviews. Previously it just showed the average of all the ratings, but now there's an elegant way of seeing the breakdown:
(I'll admit I'm partial to this particular set of reviews, because they're for Bit Literacy.)


I think I first saw this on www.librarything.com
newegg has had the same thing for years, link goes to example.
I think this is good. It'll show you if something is polarized, with a lot of 5's and 1's (which I imagine happens a lot of the material is controversial).
On Amazon, you can click on a reviewer's name to see all of their reviews: however, wouldn't it be nice if you could hover over their name to see the average rating of all their submitted reviews without having to leave the product page?
This way, if someone typically gives low ratings, you can judge their review accordingly; for example, I tend not to trust people whose ratings are overwhelmingly negative or positive.
The good folks at Summize (http://www.summize.com) go one better, IMO.