White House for Kids http://www.whitehouse.gov/kids/whlife/index.html
National Geographic for Kids http://www.nationalgeographic.com/kids/
I Know That http://www.iknowthat.com
Fun Brain http://funbrain.com
Enchanted Learning http://enchantedlearning.com
Internet 4 Classrooms http://www.internet4classrooms.com
Scholastic http://www.scholastic.com
Second Grade Vocabulary http://www.jc-schools.net/tutorials/vocab/