This combines the satellite and aerial imagery with a road maps and border lines layer. Really a great new feature.
With Google Maps, you can view a map of your driving directions or a specific location. But you can also access a satellite image of this same location if you'd like. You can zoom in on this image for a closer look at the terrain, zoom out for a grander perspective, or pan in any direction. This interactive satellite view gives you a chance to explore and evaluate your locations in far greater detail. (Plus it's just really cool.)
If you can't decide between viewing maps or satellite imagery, choose the hybrid view, which superimposes map data—including streets, street names, and landmarks—over satellite images.
Currently it's available for maps in the US, Canada, UK and Japan.