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AMD was issued US Patent 6,800,933 titled "Integrated circuit cooling device" in October, 2004 for "Various embodiments of a semiconductor-on-insulator substrate incorporating a Peltier effect heat transfer device and methods of fabricating the same are provided."

It would seem AMD is taking the idea of integrated CPU/Peltier coolers seriously. Websites that follow the PC hardware industry have pointed out that having a patent does not mean products need follow, but that the idea is taken seriously I find interesting:

http://www.xbitlabs.com/news/cpu/display/20041022085709.html
http://www.theinquirer.net/?article=19205