What it is
Link
Who Wants to Win a Million Dollars? - The Science Game
http://education.jlab.org/million/index.html
Ed Heads - Activate Your Mind
http://www.edheads.org/
Survivor Game - Darwin
http://science.discovery.com/interactives/literacy/darwin/darwin.html
NASA - Kid's Club
http://www.nasa.gov/audience/forkids/kidsclub/flash/index.html
Star Child - Young Astronomers
http://starchild.gsfc.nasa.gov/docs/StarChild/StarChild.html
Living Things - games & quizzes
http://www.woodlands-junior.kent.sch.uk/revision/Science/living.htm
Math Games
http://www.coolmath-games.com/
Slush Rush
http://www.kineticcity.com/mindgames/muddles/
Animal Classificiation
http://www.quia.com/cm/1130.html
International Space Station
http://jn016.k12.sd.us/ISS.htm
Planet Hop
http://starchild.gsfc.nasa.gov/docs/StarChild/solar_system_level2/activity/planet_hop.html
Roller Coaster Design #1
http://pbskids.org/fetch/games/coaster/index.html
Roller Coaster Design #3
http://www.learner.org/interactives/parkphysics/coaster/
Fun Brain
http://www.funbrain.com/
Molecular Geometry
http://introchem.chem.okstate.edu/DCICLA/jmol/jmol.php
More to come...