NASA
National Aeronautics and Space Administration: Scijinks: Satellites Technology
Describes satellites including what they are used for, important roles they play, how a weather satellite is built, and how a satellite stays in orbit using text and video of varying length.
European Space Agency
European Space Agency: Esa Kids: Our Universe: Satellites
A basic introduction to artificial, or man-made, satellites. Links to information about the planets and other objects in our solar system are included.