I've run across a new program for my Mac called smcFan Control.
My MacBook was running at temperatures of 180+ degrees, frying my legs and negating its use as a laptop. After running this program, the temperature was down to 120 degrees. Huge difference.
It makes your Mac's internal fans run at whatever speed you want them to. And it has a great icon.
Check it out: http://homepage.mac.com/holtmann/eidac/