Hey, I was wondering, do the new iBook G4's have cooling systems? i.e. a fan? I've noticed that there is a small vent next to the I/O ports on the left side of the exterior, is that a fan? I'm wondering this because I have yet to see any other ventilation openings on the computer, and since the processor gets to as high as 1GHz, it must need more cooling than just a breeze passing through the inside....