I know this would be a tall order but it would be cool to have an in-game DPS rotation suggester based off of your spec/talents/stats. I first saw this at www.maxDPS.com but when 3.1 and dual specs came out the site hasn't, to my knowledge, updated itself for these changes.
If anyone can make this an in-game UI feature it would be you.
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Some days your the dog. Some days your the hydrant.