Based on comparing a last gen 20'' iMac (2.16 GHz) to the new iMacs at the Apple store, the last gen iMacs run a lot cooler. The new "thinner" casing probably contributes to the AL iMacs running hotter to the touch. Did the iMacs really need to be made thinner? As far as I can tell, the form factor doesn't change drastically, as a result. Unless doing a side-by-side comparison, does the thinner depth make a difference in the look of the computer? Might it have been a better design choice to leave the case the same size, either allowing for a cooler-running machine, or the possibility of using a more robust graphics card, or CPU, etc.? In short, do the iMacs "need" to be "thinner"? Does form begin to impede function, in this case?