J-Track 3D Satellite Tracking is an online educational tool that maps hundreds of satellites as they orbit Earth. One of the ironies of the space program is that it's greatest scientific advances from the space program is in observing our own planet instead of deep space. J-Track 3-D should appear in its own window and plot the satellites in an interactive panel. This is a great way to learn more about the remote sensing platforms that give us all the beautiful imagery of our planet.
Via Seth Dixon