I love ProductWiki! For those unfamiliar with it, it’s basically an interactive review system:
People write pros and cons of a product, and other people can agree or disagree… Web 2.0-style (basically like voting on comments on many community websites and blogs)
That way, after a decent amount of votes, you get a nice overview of the most important aspects of a review. For example, you could choose to only show pros or cons above a certain “agree-treshold”. This way useless reviews will simply disappear.
All the most important pros and cons of a product will get the highest attention this way, which is an improvement over the regular star-voting in my opion.
To see this all in actions, check out this example for the PS3 (scroll down to Pros & Cons, check out this page for a detailed list)