A&E Television
History.com: The States
Learn unique facts about each American state. You can also read a more in-depth history of each state, watch videos and play a game about all the states.
Annenberg Foundation
Annenberg Learner: United States History Map: 50 States
Read about the regions of the United States, find the states in those regions on maps, and play a game to locate the states. A great interactive review.