http://www.coolbook.se/CoolBook.html
I would remove it by enquiring the developer at the above link. If you feel you have heat issues with your machine, you should be running the hardware test that came with it:
http://docs.info.apple.com/article.html?artnum=303081
Note the temperature monitors INSIDE a Mac have no documentation from Apple as to their upper or lower limits for any of their computers. The software used to monitor the heat has completely arbitrary guidelines on what is too hot. A computer will only be too hot, if it automatically shuts down even when told not to do so by Apple's Energy Saver in Apple menu -> System Preferences -> Energy Saver. Apple's notebooks have not been "laptops" for years, and should not be treated as such, without proper shielding for your skin. They can burn your skin and still be perfectly functional.