Ctrl + Alt + T Hide/Show Toolbar.
F11 Full screen mode - Toggles between full screen and window view for the Google Earth application.
Ctrl + S Save Image - Saves the current view as an image to your computer.
Ctrl + L Lat/Lon grid - Produces a latitude and longitude grid over the surface of the earth in the 3D viewer.
Ctrl + Shft + O New image overlay - Produces the New Image Overlay dialog box.
n Reset view to north - up - Rotates view so that view is north-