NASA
Nasa: The Space Place: The Three Little Piggy Back Satellites
This site from the National Aeronautics and Space Administration allows one to read the "Three Little Piggy-back Satellites," and then play the Nanosat Flingman game. [Requires Shockwave]
California Institute of Technology
Cal Tech: Stories From Space: What's in Space?
Through this story you will be introduced to outer space: stars, the Milky Way, planets, the Solar System, the Sun, clouds of dust and gas, galaxies.