Science Millionaire -  Who wants to be a Millionaire w/ a Science theme

3D Simulations- Fun 3D games 

Molecularium - Fun Molecule Game

National Zoo - Build a Panda Habitat

Braingle - Fun Math puzzles

NGA for Kids - Art Web page 

Space Explorations - a few fun games about space

Mancala - an ancient game, now online!   

Where in the World? -  A fun map skills game

Fun Brain Math - a math arcade