NASA has come up with its own equivalent of Google Earth. It is called World Wind and comes in an MS Windows version only (which means I haven’t given it a go yet as I rarely use my PC anymore). What does World Wind do? According to the site:
World Wind lets you zoom from satellite altitude into any place on Earth. Leveraging Landsat satellite imagery and Shuttle Radar Topography Mission data, World Wind lets you experience Earth terrain in visually rich 3D, just as if you were really there.
Virtually visit any place in the world. Look across the Andes, into the Grand Canyon, over the Alps, or along the African Sahara.
I think this is worth trying out and as soon as I can peel myself away from my PowerBook, I’ll give it a go and let you know what I think.