Google Earth lets you fly anywhere on Earth to view satellite imagery, maps, terrain, 3D buildings, from galaxies in outer space to the canyons of the ocean. You can explore rich geographical content, save your toured places, and share with others. Available also on Android and iPhone: see http://www.google.com/intl/en/mobile/earth/ More info »
Google Earth is fun, though I'm not sure if it has any practical application.
This works great, I even used it when I was in my geology class, I would find the places that we went to in person. It has a lot of nice features, I enjoyed the sunrise/sunset ability. The street views that this has are really cool too.
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