Make-A-Flake: Snowflake Maker
http://snowflakes.barkleyus.com/

Y8 - Awesome flash game site
y8.com

Addicting Games - Another flash site
addictinggames.com

createaride.com - Create cool cars, beetles, etc.

coolmath-games.com - Somewhat childish, but there are games that are fun. IQ Ball, Block Battle, and Rolling Hero are some of my faves



(Also, on a Wii, you can access Gaia... XD)