Is this being motivated by "I just want a really efficient way to switch between desktops in different OSes?" If so, VMWare Workstation in full-screen mode is

Is this being motivated by "I just want a really efficient way to switch between desktops in different OSes?" If so, VMWare Workstation in full-screen mode is a configurable key chord (Ctrl-Alt, Alt-Tab) away from the host OS. I use Windows 7 as host (on a midline Dell laptop) and Ubuntu something-or-other in the VM. This is my primary dev environment and works great for my purposes. There's also a Unity option, where they just put (e.g.) Linux apps as first-class windows within Windows, but the UX of it hurts my head. If, on the other hand, you're e.g. worried about the performance hit to the VM given that the host OS is constantly running, then this won't help you.