2.6GHz MBP with 512MB G84M GPU and the 7200RPM Hard Drive. I purposely run the fan at ~3000rpm at all time using smcFanControl and the CPU temp varies between 41-47 deg during light activity. The GPU is usually much warmer, around 55-65 deg. With both cores and vector units pegged, the CPU hits around 58 deg and the GPU can go up to nearly 80 when stressed.
In Windows 2008, the GPU is always around 70-80 deg, which is a little worrying considering that NVIDIA has just acknowledged that all of the G80-series GPUs are prone to overheat and fail, just like the R500 ATI GPU in the Xbox360 (which overheats and burns out, causing the infamous "red ring of death" failure). I think that these GPU companies need to chill out a bit (literally and figuratively) with introducing a faster, more intricate, higher power consumption, 50% transistor-count bumped model every single month and focus on making GPUs and drivers that actually work and offer solid stability. I mean, NVIDIA's latest GPU card (the 10th series GeForce) is the size of a football, runs around 100 deg and requires 310W at full utilization (a separate power supply is needed just for the GPU).
I think Intel learned this lesson a few years with the Pentium 4: just because it is technically possible to build a chip with billions upon billions of transistors and introduce a new model every week (now with even more GHz!!!) doesn't make it the best long-term strategy.
