Scott Hanselman has a very interesting quote from "super-secret-have-to-kill-you-sources".

Now for the good word. Rumor is that Microsoft already have Vista running on iMacs on campus. Likewise it's rumored Intel has a Vista build running on Mac hardware. So it not only feasible for some users, there is a reason other than just the pure challenge for a good many. [super-secret-have-to-kill-you-source]

I'm not surprised that both MS and Intel would be interested in seeing this work.  I'm pretty psyched about it as well.  I think that the iLife apps are really nice, and the Apple hardware is beautiful.  I'm not sure if I'm willing to give up my Tablet for a MacBook, but maybe if they come out with a 12"er.  I still think it would be way more useful to have VMWare on OSX, and maybe a version that support the virtualization that the CoreDuo chip can do.