A proposal of how Win8 can better integrate Metro and classic desktop
By default, show the Metro interface, but when you click/touch a blank section (not click on a tile or activate charms), the desktop is activated and you see the start menu, desktop icons, etc. To reactive Metro, press the Windows key. In a sense, the desktop background and Metro background are the same static image. What changes is the overlay of Metro tiles or the classic desktop. I got this idea from reading http://www.winsupersite.com/blog/supersite-blog-39/windows8/windows-8-start-screen-142666, but Paul Thurrott's post is more about customizing Metro's background than changing how Metro and desktop can work together better.