A few shortcut keys are available within Windows 7 for laptop users. The first combination is the Windows Key + X. This should open the Mobility Center dialog box. This shortcut works with Vista as well. This dialog box has subsections for components such as wireless settings and projector output.
Another shortcut combination is the Windows Key + P. This should cycle through the various projector options as far as if the video should only be on the projector vs. on both the laptop screen and the projector, etc.