I had this issue before anything was written.
On my 2nd black wifi 64 GB iPad (exchanged the first), and it's way too hot after ~10 min of web browsing or reading pulse news. It's warm in like 3 minutes then proceeds to hot. The screen doesnt even have to be bright. I had always set up as a new device with location services disabled. It's ridiculous.
I find it very hard to believe those of you that claim to not have this problem. I'm not participating in any stupid fanboy wars, either. I bought 4 very expensive apple products last year that have been mostly perfect. This, as it currently operates, is garbage.
I really wish the hot components weren't on the same side as the home button...
I'm not sure if I should attempt another exchange or return. I love the screen, but I'd rather be using my cool iPad 2.