While many of you out there have used Google Maps, I think far fewer people have tried Google Earth. It's a bit of effort to download and install, but the experience of flying around real-time 3d accelerated satellite maps is worth it. Works on Mac and Windows.
One of the cool new features in Earth is a very recent 3 inch scale overhead photo of Las Vegas. Touring the strip is fun; at 3" you can make out the bathing suit styles at the pool. I'm most taken by the incredible reflection off the Luxor; the image has about 8x more zoom in it for detail.
See also the unofficial Google Earth blog