I’ve had a chance to play with Google Earth briefly, and it seems pretty much the same as the Keyhole software that Google bought out. The user interface has been changed a bit, but the same basic features are there. Of course the biggest change from Keyhole to Google Earth is that Google Earth is free! You can pull up maps of the entire world, and depending on the location pull up hotels, restaurants, street names, etc, get directions, prepare a slideshow-type flyover, and much more. Besides the free version there are versions that costs varying amounts of money. The Plus version allow you to integrate a GPS. The Pro version is for businesses, and the Enterprise version lets you integrate a lot more data.
Hey, the software is free. Go to the site, download it, and install it. Play with it. It’s fun! You can get more details and download it at http://earth.google.com/