NASA World Wind v1.4
NASA World Wind allows any user to zoom from satellite altitude into any place on Earth, leveraging high resolution LandSat imagery and Shuttle Radar Topography Mission (SRTM) elevation data to experience Earth terrain (or any planet with the data) in visually rich 3D, just as if they were really there. Virtually visit anyplace in the world. Look across the Andes, into the Grand Canyon, over the Alps or along the African Sahara.
World Wind is open-source and completely free to use. Zoom in and check out your neighborhood, find your backyard pool, the possibilities are endless.
World Wind really needs a high-speed DSL/Cable connection to download satellite imagery, and a Geforce2/Radeon 7500 and above for graphics acceleration.