OR you'd have to add an emulation layer all the same, which would kind of defeat the purpose. Let's just say it's a nice thought, a nice hobby for some - and maybe, just maybe parts of it will prove useful in, say, 2009.
If you've followed the WINE project, you know that it took them quite a while to become useful. And that was on a platform with much more interested and capable people behind it. I'm not saying Mac people aren't capable, but most of them just aren't interested so much in developing free software for free and fun. ;-)
If you really _need_ to run some Windows applications, VPC is the way to go. From a user's perspective, that's a nice option. The other option: Buy a cheap PC and a monitor switch box. The third option, of course, is to ignore the bad, bad Windows world.