Mine does not get hot at all... The cpu cooling system in the 9860 is completely effective. I have no doubt that it will take care of any future processor as well. I run full time at just over 4ghz, at first I did not, I just figured 3.8 was fine, then I ran so many tests to find out more about the machine, it's capabilities and video card vs cpu overclocking, that I finally just left it at 4ghz. This is the 3.8 prescott cpu and there is no difference in cpu temp running at 4ghz vs 3.8. Honestly, this makes good sense to me too, sure it's 200mhz more, but there is no voltage increase and come on, lets be realistic here, all intel cpu's are famous for great overclocks, and this is because they are pretty high quality. So... While I do not want to start a huge overclock'ing parade and run the risk of some super rare occurance happening and someone's machine stop working, I see absolutely nothing wrong with finding your machines sweet spot and leaving it there.
I just took a break from Eq2 (extremely intensive on any machine) to type this and browse some forums, and hitting mobile meter shows a lowly 47deg C. I have seen it at like 53deg C during gaming before, but this is VERY good for a laptop. I have had a crapload of laptops dating back to passive matrix screens and simple pentium 90s, and I must say, this is the most promising laptop yet! I like the look of the new Dell xps2, but I'll bet a pile of money, what you order is what your stuck with. With this 9860, there is a lot of room for improvement in the video card slot. The heatsink does not even take up 100% of this area underneath. You could theoretically make a large heatsink with a large single or dual small fan to remove a lot more heat. Would just require a simple reworking and a new bottom panel to allow more air to be sucked up. I would love to see an aftermarket heatsink/fan/cover to replace the "workable" one that comes installed. Think of an overclocked 6800ultra with an all copper largish quiet fan and new cover installed in an overclocked 6xx series extreme edition, it would be a wet dream! I thought about making my own, but it would take some time to mill out all the crap to fit and bolt on properly. Maybe I will start working on one sometime here and have it ready for the new line of video cards... Hopefully ATI will come out with a mobile R520..