That's not true. Windows CAN control the fans; I actually have them cranked up to 5700 RPM. I know that temps of 60-70C aren't dangerous to the MBP, but it sure as **** is annoying to my hands.
The CPU has been undervolted, but the real issue is Windows using the 9600M, which generates a LOT more heat than the 9400M. Until Apple decides to stop blocking Windows/Linux from accessing the 9400M, "anything other than Mac OS X will generate heat." And, for the record, I do get the same issue under Ubuntu.