Planets: Simple Facts
http://library.thinkquest.org/J0112461/planets.htm

Science Monster
http://www.sciencemonster.com/planets.html

The Planets
http://www.enchantedlearning.com/subjects/astronomy/planets/

(The links listed above were given to us by M. MacLean (Dylan's Mom)

Other Solar System Sites:

NASA Space Technology Instrument and Sensing Technology: Planetary Tour Guide
    http://ranier.oact.hq.nasa.gov/Sensors_page/Planets.html

NASA's Planetary Photojournal
     http://photojournal.jpl.nasa.gov/

The Nine Planets: A Multimedia Tour of the Planets
     http://seds.lpl.arizona.edu/nineplanets/nineplanets/nineplanets.html

Planetary Fact Sheets
     http://nssdc.gsfc.nasa.gov/planetary/planetfact.html

The Planetary Society
    http://www.planetary.org/