With regards to taking the iMac apart to upgrade things like the hard drive, etc... I noticed when looking at them (and indeed this fact is trumpeted on the Apple web site) that there are no seams in the aluminum casing, other than the tiny memory door at the bottom. From what I can tell, the entire thing is one piece, completely enclosed, save for the screen. I will be fascinated to see someone figure out just how the hell you get in there.