quiz games
http://quizhub.com

Architect Studio 3d
http://www.architectstudio3d.org
Flash - design a house

CyperChase
http://pbskids.org/cyberchase/games.html

National Georgraphic for Kids - Games and Adventures
http://www.nationalgeographic.com/kids/games

Fun Brain
http://www.funbrain.com

Fun School
http://www.funschool.com

Lawrence Hall of Science - Online Games
http://www.lawrencehallofscience.org/kids

Nature Shift
http://www.natureshift.org/kids/index.html

BBC Dinosaurs
http://www.bbc.co.uk/sn/prehistoric_life/dinosaurs

Javascript Games
http://www.kielack.de/games.htm

Reading games
http://www.rig.org/readingplanet

Planet Oz
http://www.planetozkids.com