Keyhole - Google does Satellite Maps

Very, very cool. This software ($29.95 for a one year subscription, 7 day free trial) allows one to fly, virtually, around the world, hopping from place to place using satellite imagery. Where it is hi-res, its great - a lot of the urban areas of the world are very hi-res. Manhattan, London, etc. The software allows you to tilt the viewing angle so it appears you are flying in a plane with a good sense of the terrain below.

Link