Level 1 Websites
http://www.funbrain.com/kidscenter.html
http://www.kidswb.com/games/batman-ultimate-rescue
http://www.lego.com/en-us/games/default.aspx
(as long as there are no guns & blood)
Level 2 websites
http://www.playkidsgames.com/newGames.htm
http://www.aflcio.org/unionshop/games/game_mancala.cfm
http://www.coolmath-games.com/
http://www.multiplication.com/games
http://www.arcademicskillbuilders.com/games/grand_prix/grand_prix.html
http://www.noodletools.com/noodlequest/index.php
For research purposes
http://thinktank.4teachers.org/
helps students write research papers
http://persuadestar.4teachers.org/home.do
helps students write persuasive essays