Silencing the MacBook Pro

On the Apple forums, someone has described a process to remove the noise from some MacBook Pros.
It is as simple as modifying some variables in the "IOPlatformPluginFamily" extension.
Note: this modification does not work on every machine, in addition it could have a negative effect on battery life.
http://discussions.apple.com/thread.jspa?threadID=461317&tstart=0