I guess I was the lucky one with all my MBPs. I had a 2.00Ghz CD MBP with 256mb VRAM and 2GB RAM and it ran below 40C on battery and just above 40C when charging. Just before my warranty expired I started having some problems with my screen and while in repair the logic board was damaged. Apple gave me a new MBP C2D 2.33Ghz. The temperature right now is 36C and the bottom is hardly warm. Top of the laptop is actually quite cold. It's running on battery.