The HD is under the left palm rest according to the manual (and my own personal experience opening up the case
). The GPU is roughly around the F10-F11 keys, maybe right above it, judging by how hot the brushed aluminum LED above the keyboard gets.
AS5 on the CPU doesn't seem to make too much of a difference. My AX7 gets roughly 40-44C on max battery save (833Mhz), and as hot as 60C on max performance (2.2Ghz). Once you get the GPU heated up (like in FarCry), you're pushing 70C. However, the fans are more than capable of knocking this back into the 50s within seconds of your exiting the game.
I noticed that I can usually trim 2-3C easily if I prop the back of the unit up about an inch (about the width of a "Dummies Guide to..." book). I guess the extra volume under the intake fans really makes a difference.