We run a print production environment and need to have many windows open for email, PDF processing, print production and file management. To be able to split these up would be great but Desktops does not work with us. The worst part is that you cannot open up any browser (chrome, firfox or ie7) in multiple desktops. The browser just fall flat on their face or close the open windows in the other desktop.
By the way you can shut down desktops without logging of by ending the "desktop" process in task manager.