I checked out the 17" MBP in an Apple store at the weekend. It was running with the power connected and there were a few apps opened, but none were actively running (as far as I could see) and it was very hot to touch. I mean any hotter it could burn you. You cannot use it on your lap, not for long anyway. I guess when it is running on battery power the CPU is running slower so it will not heat as much. I wonder how hot it gets when it is working hard with the power connected. I would not be using it on my lap so much, but I am wondering if it is going to get so hot even when running on battery power. Is there a way to dial down the CPU power and avoid the heat build up? What are your impressions of this?