No overheating on mine. Ive tried out Call of Duty, Return of the King, UT 2003 and runs fine for hours. The bottom does get warm but I just have the laptop flat on a desk. The readings from I8kfanGUI all hover around 45-55 C for cpu, ram, gpu, hd after gaming.
Ill try and remember to take a screen shot after I play games on it.
I got my 8600 in yesterday, and I've also noticed that the left side gets slightly warm on the top, and quite toasty on the bottom. It's not really noticable unless you have it sitting on your lap though. It has lived up to it's quietness reputation however, except for the cd-drive, I never really hear it.
Disclaimer: I've never owned a laptop before, so I'm not sure how hot a "normal" one gets. Just going by how it feels to me.
I got my 8600 today and have not noticed any overheating. I played COD for two hours straight and my only complaint is the keyboard but I guess I'll go to home depot and get some foam to fix it. The WUXGA is very nice and the chasis doesn't seem as bad as everyone makes it out to be. It seems almost as solid as my old IBM 600. Oh and NO DEAD PIXELS.
My GPU is actually the coolest of the components. However, RAM heats up to 85 degree celcius while everything else reaches only 55 at most. Im not sure if its supposed to rise in temperature like that or not but the Dell is still running