I had similar problem but with GPU temperature of my G1S. After 1.5 years of nearly everyday gaming my GPU died (black screen all the time, windows is loading fine, playing some startup music but nothing on the screen, even backlight lamp was not turned on and nothing to be seen on the matrix).
Since I was lucky that it happened under warranty, I sent it back to Asus for repair without HDD. It went to some repair company in small city near Vienna, Austria. After one month they send it back with new mainboard installed. Screen was working again, but I couldn't play games anymore. After notebook is powered on in takes about 10 minutes for GPU to get to 105C temperature in idle Windows. And if you start game it goes very fast to 110C and at this temeprature driver is reducing FPS to 5 or so to prevent overheating. Basically you see slide show for couple of minutes and then blue screen of windows in the end. The only chance to play something was to power off laptop, wait for one hour, start it and start the game as soon as possible. But it works only for 5 minutes and it's hot again.
I send it back with HDD inside and installed Left4Dead and CPU/GPU hardware monitor which shows the temperature. They waited till my warranty expires and proposed me a replacement notebook G1Sn with slightly better internals but worse screen resolution (1440x900 instead of 1680x1050). It has 0 month warranty but it works so far. If I will have this problem again I will disassemble it and change the design :)
My collegue at work also had such laptop, but it died after 3 years because of GPU. He wasn't playing games at all, therefore, it took twice longer then mine. So, it's better to kill it faster while still on the warranty, I would say… and a lot of zombies in the process too (I'm playing mainly Left4Dead).
Yer, it's very sad that this laptop has such problems. Especially because it supposed to be gaming laptop. I like it a lot, how it looks and that tiny LCD display which shows current time - very helpful while playing games indeed.