PBSkids.org - A place where you can play games like Curious George.  He has 16 more games.
The Magic School Bus - is a fun way to learn about the world and animals.
Nick Jr - Have fun with some of your favorite characters like Dora, Blue and Franklin.
NASA Kids Club - Learn about outer space and more!
Colgate Kids - Teeth Games for kids.
Funbrain - All kinds of games
Colonial Williamsburg Kids Zone - History Games
PBS Detective Games
History.com - History games
Tommy Whitefeather - New England History