> A significant amount of the cooling is > done through the top of the computer - ie around the keyboard - and > keeping > the lid shut inhibits cooling. Not to argue, but is this really true? I have 2 points: 1) The aluminum 12" (as well as 15" and 17") is made to run with the lid down in extended desktop mode, and it runs a G4 at higher speeds. One would think those could get even hotter! 2) If you lift your keyboard out, you'll notice that there's no ventilation on the bottom of the keyboard...it's a flat piece of plastic/metal. It seems like it would prevent air from flowing thru the keyboard...so maybe this isn't really a concern? Does anyone disagree? jesse .