According to Softpedia, some of the Apple MacBook Pros have had a bit of a noise problem. It appears as though some of the newly shipped MacBook Pros emit a high-pitched whining sound when the brightness level is too high and will stop when they lower the brightness or launch the PhotoBooth application. Random.
Some owners claim the sound is unbearable, while others claim you can only hear it in a completely silient room. Apple has made no official comments.
Owners who have elected to send in their MacBook Pro for replacement will have to wait up to a month to get a replacement.
I say get some headphones you whiners.
Macbook Pro Whines [Softpedia]