Math (and Other Subject) Game Sites:
2. http://www.gamequarium.com/
4. www.mrnussbaum.com (other subjects too!)
5. www.reviewgamezone.com (other subjects too!)
6. http://www.sheppardsoftware.com/math.htm (other subjects too!)
8. http://www.funbrain.com/brain/MathBrain/MathBrain.html
9. http://www.multiplication.com/games/all-games (multiplication tables practice)
10. www.coolmath-games.com (mostly logic and memory type games–great for increasing problem solving ability)