Actually you're the one who needs to wake up because if you were awake you'd of known that the iMac has used notebook components for a long time. Do you see Quad-Cores in notebooks yet (I'm not talking about the notebooks that get a 5 minute battery life)?
There are low power quad cores that have been developed for 'all in one' PCs like the iMac. Intel released them in January. I've already seen a quad core iMac-clone from Philips.
On a related note, can anyone recommend a decent Core i7 PC, because I'm sick of being locked in to Apple hardware and not being given the option to buy an Apple machine with the specifications that I want. I love OS X, but I'm seriously thinking that being locked into a single manufacturer is a very bad thing. I may have to go for an i7 hackintosh, at least until Apple realise that they can't go on selling obsolete hardware at a huge premium.