Who knows what is "normal" fot this thing. I finally took mine in to Apple yesterday. They called me this afternoon to say that they put the thing through all types of tests and it works perfectly; no hardware problems, no software problems. They conluded that it was my case that was making it hot. Then, I told them that I bought the case more than a week after I got the MBP, which was unbearably hot during my first use of it; and were it not for the case, some days I would not be able to type on the thing, as the case covers the palm rests as well.
Needless to say, I was happy to hear there were no discernable hardware problems - since it was an open box - but bothered that I had no answers to the problem. I was not in the best of mood when I got to the store, but then I talked with a couple of guys there who really tried to explain a lot to me, and the one had to admit that although the computer did run cooler with the case off it, the comp does run a little warmer than he had seen previously on other Macs. They did offer to replace some parts in the comp and to make sure that it has enough thermal paste on the inside. At least that was the one guy's suggestion, who, once the second guy walked away, was the one to say that he believes there is something going on.
The first guy reminded me that any flash content will stress the computer and raise the heat leve, and that as I am coming from a plastic to aluminum body, I will feel a little more heat than I am used to. Yada yada yada - Some of this I buy into, but I am happy that the one at least admitted that he found the computer a bit warm. I told them both that I feel that Apple has what they consider to be a normal range of heat emminating from the Macbook - and some of us have gotten machines that operate at that high end of normal. They just stared at me!
In the end, one of the guys said he would place the order for the parts that I need, and I agreed to keep the comp, at least untl Sunday. If nothing else, there is a record that I brought this to their attention, so if the problem continues, and I have to take it back, there is already a record of my concerns. I do have Apple's one year warranty and Discover Card will cover it for an additional year.
I suggest that you take yours into an Apple store if you are able to. And for the record, they suggest that you use the MBP on a flat surface, do not use a keyboard skin (which I do anyway on most occasions), and do not use a case that might impede airflow near the hinges, the back and underneath the computer. I told them that I would try using mine without a case and see what happens - only because I have noticed that it has gotten much cooler over the past 2.5 weeks, with some random unbearable spikes here and there. It if can actually stay cool, for several days, then I might entertian that the case is at least impeding proper air flow, but that vicious heat was there from day one.