Math

http://www.mathnook.com/

http://www.factmonster.com/

http://www.learn4good.com/games/kids.htm

http://www.learn4good.com/games/kids/double_digits.htm

http://www.coolmath-games.com/

http://kidsgames.suite101.com/article.cfm/more_free_math_games_for_children

http://resources.kaboose.com/games/math1.html

http://pitara.com/games/

READING

http://www.starfall.com/
This is a great site for kindergarten and first grade students