Hey.
DjZeaklous started a thread named The Purpose of Reviews. It has some good information on how to give more helpful reviews.
I encourage you to take a look, if you've not already seen it.
Also, there is a Flash named Whistle Evaluator, by coocooletmoi. It's a quiz-type run of marking reviews as helpful, useless, or abusive. It's a bit short, doesn't show you results for individual questions, and I can't get above 90% (Gold Whistle status), but it's worth a look as well.
Thanks.
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- Ziro out.