I just got my new 15" i7 MBP yesterday. It has the 7200 RPM option. I've noticed a steady vibration under my right hand/wrist just to the right of the trackpad. This is constant....its not limited to just those times when the hard drive is spinning. Anyone notice this? I won't say its enough to be annoying, but it is different. I never noticed this on my older non-unibody MBP but then again that area contained the Superdrive in the past. This feels like either a hard disk spinning or a fan turning...can't tell which.