snip from their ad:
Incidentally, the one thing you won?t hear is a fan. There isn?t one. Because unlike PCs that require noisy cooling fans to avoid overheating, the iMac takes advantage of a unique design feature to cool itself quietly [and overheating a lot]? thus adding even more to its coolness factor.
Bwahhaaha, Macs sure suck! (disclaimer: exect for Macs running clients for TA )