I started a thread similar to this one late last week:
http://rog.asus.com/forum/showthread.php?17270-What-are-your-stress-test-max-GPU-amp-CPU-temperature...
Since I only got one reply, I'll post my numbers here:
G75VW-BBK5 stock thermal compounds; no overclocking of GPU
Ambient: 24.6 degrees C
Idle CPU: 40 degrees C
Idle GPU: 39 degrees C
FurMark setting: 1920x1080 windowed, Anti-aliasing 8X MSAA running 20 mins
Max GPU temp: 70 degrees C
Max GPU fan speed: 3455 RPM
Prime95 stress test running 20 mins
Max CPU temp on any core: 83 degrees C
Max CPU fan speed: 3422 RPM