I've been a fan of VirtueDesktops for awhile but had only used hotkey shortcuts to switch screens. Apparently I was thinking way too Interface 1.0 because now you can literally "slap" your PowerBook to switch desktops. It uses the anti-drop Sudden Motion Sensor to detect ... what else? ... sudden motion and relays that information to SlapBook. Download it now and start expressing your frustration... productively!