Cool satelite tracker from NASA that uses Java (if you don’t have Java you can see some other links they provide but they really are not that great). You can use your mouse to spin the globe around and see satellites. You can also select specific satellites and see their orbits. A nice fun quick visit.
Related: Voyager 1: Now 100 Times Further Away than the Sun – NASA Robotics Academy – Saturday Morning Science from NASA – Solar Storms

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Very cool tracker indeed. If you don’t have Java installed though, I recommend using this one: http://science.nasa.gov/temp/Hubble2Loc.html