http://www.glendale.edu/kids/space&planet.htm
www.sciencenetlinks.com/interactives/moon/moon_challenge/moon_challenge.html
(moon phases)
http://library.thinkquest.org/J0112188/moon_phases.htm
(moon phases)
(Compare Planets)
http://science.discovery.com/interactives/memory/solarsystem/solarsystem.html
(memory match)
http://starchild.gsfc.nasa.gov/docs/StarChild/solar_system_level1/planet_go.html
(label the planets)
http://starchild.gsfc.nasa.gov/cgi-bin/StarChild/planet_tac_toe.cgi
(tic-tac-toe)