DarWINE will eventually do this on intel Macs. At least for some applications. Crossover plugin will be the commercial implementation of that. (Already works for linux. See result reviews for that to evaluate whether it'll be worth the wait...)
My guess and hope is that Apple and Microsoft are working quite closely to bring a good version of Windows compatibility to intel Macs with a future version of VPC. It's been said that Apple's working with Microsoft on VPC.
Mac user since 1987. Running Mac OS X 10.8 Mountain Lion on a MacBook Air 11" & an iMac 27" and whatever's newest for my iPhone 4s, iPad 3 and AppleTV 2.
Apple Certified System Administrator 10.6, Apple Sales Professional 2008-2011, Apple Certified Mac Technician.