After reading about how the core processors disable certain portions of the processor based on need, this definately sounds like an electrical interference problem that is the fault of the intel core processor, and probably has nothing to do with apple's design. Processors ususally run at higher frequencies than are audible, but I'll bet that during mostly idle times there are certain parts of the chip that are cycling on and off at frequencies that we can hear. If this interference is strong enough to make audible noise then I wonder if it is also the cause of the airport connection problems that I have heard about. I'm willing to bet that apple will not be able to fix this problem without hosing the battery life.....that is until intel respins the chip and comes out with a rev. b version.