I downloaded and tried Google Earth recently.
There is no one to match Google when it comes to designing user friendly web interfaces with maximum functionality. This one just proves that point. Gmail's UI is way ahead of any other mail service.
But for me Google Earth now just looks like a 3D Map without Real-time data. One day real-time data with more precision might be available on Google earth or any leader in that service that time... So that we can check whether our cycle parked outside is safe through those satellite images. Wow let us hope we can be the james bond sooner