Nasa worldwind
Similar to Google Earth, but has some cool features like being able to overlay USGS topo maps, and other images over the 3d landscape.. you cant zoom in as much, but its pretty sweet!
http://worldwind.arc.nasa.gov/
Trevor
Similar to Google Earth, but has some cool features like being able to overlay USGS topo maps, and other images over the 3d landscape.. you cant zoom in as much, but its pretty sweet!
http://worldwind.arc.nasa.gov/
Trevor