I recently got a week 17 2.16ghz MBP. Note - this is with updated SMC firmware. When I recieved it, I noticed it was hot, so I loaded up Speedit, and fired up 2 x yes > /dev/null. The temp on the cpu started going up quickly. The base of the laptop became very hot and the area above the F keys. Tee noticed the fans only came on when the cpu got to 65 degrees, and then it levelled out at 74-75C. Even then, the fans weren't on very strong and the bottom of the case was blistering hot. Over this weekend, I had to open the box up to change the hard disk, so I figured that while I was in there, I'd swap the thermal greese for arctic silver5. got rid of the old dried out goop apple were using and applied a small amount of AS5. Now, when I run the same yes > /dev/null test, I see the following: CPU heat up rapidly, but the bottom of the case doesn't get hot unless you leave the CPU running at full for more than 30 minutes. THe fans come on now when the cpu is at 45 C and the cpu doesn't get past 65C. The whole time though, the laptop was on my legs and wasn't burning like it was before! Under normal usage patterns, the bottom the case doesn't get more than luke warm the cpu never breaks 47 degrees (even with say itunes playing with visualization).