NASA Kids Club
This site features interactive games and puzzles and rockets, the solar system, space craft and more.  Very appealing for children.

Kids Astronomy
Kid friendly website with information about all of the planets.

National Geographic Solar System Site
This site has interactive information about the Solar System.

Solar System Exploration
This is a NASA site with information about all of the planets.

Space.com
This site has several images and multimedia links of the Solar System and the planets..

BBC - Explore the Solar System
This is the BBC site, with links to previous BBC documentary programs about the Solar System.