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Weird. Mine isn't warm at all and I've been using it constantly for the past hour or so.
 
I went to the apple store today to check out the new iPad's. They were all running a demo program but the first thing I noticed when I picked one up was how warm the back side was. I imagine with the larger battery and double GPU it is going to be warmer then the iPad2
 
I just noticed it too. Just slightly warm on the left corner by the home button. My iPad 2 didn't have it. It's not hot, just warm
 
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