"Was this review helpful to you?"
I just read this article on Amazon's review system and found it quite interesting. They show how a couple minor tweaks to a standard 'five star' rating system - namely adding the question "Was this review helpful to you?" and associated tweaks (use of Ajax, the 'tally feature' and ease of finding negative reviews) made the rating system much more useful and in turn added value for Amazon. Perhaps this is helpful to the developers and users of Fivestar and related modules...
http://www.businessinsider.com/the-magic-behind-amazons-27-billion-dolla...
Graham.


Fivestar Extra
I believe http://drupal.org/project/fivestarextra could do this quite nicely, in case others haven't seen this.
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