Google Earth

"When the Keyhole satellite-imagery Web service debuted last year, we were impressed with the technology... The folks at Google saw the potential too and used some of the company's IPO booty to snatch up Keyhole. The result is Google Earth 3.0: the same wide-ranging, detailed aerial images provided by Keyhole, combined with Google's excellent local search capabilities. And since the formerly $299 service is now free, we're even bigger fans. Whether you're traveling or just geographically curious, this new service presents map information using an intuitive, interactive virtual globe.Beyond marking individual points of interest, Google Earth gives you over 100 available geographical and business overlays to choose from, ranging from restaurants and other businesses to weather, crime statistics, and geology."