BrainPop - during school hours, user is windsong, password is brain http://www.brainpop.com
National Geographic for Kids http://www.nationalgeographic.com/kids/
Houston Chronicle - Education for Kids (Games) http://www.chron.com/cie/
Thinkfinity http://www.thinkfinity.org/
Puzzlemaker - great for reviewing spelling and vocabulary http://www.puzzlemaker.com