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Keyword = reviews plugin
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WP Post Ratings
Lester Chan\'s post ratings plugin allows users to rate posts.
http://lesterchan.net/portfolio/programming/php/#wp-postratings - detail
Google PR :
Ratings Shorttags
Ratings shorttags is a very simple plugin that allows authors to rate things in posts by adding a shorttag as simple as [rating=5]
http://noscope.com/journal/2009/02/ratings-shorttags-plugin-for-wordpress - detail
Google PR :