Reading is Fundamental. This web site has endless resources from finding book titles and descriptions in any genre to fun games for children. http://www.rif.org
National Geographic for Kids http://www.nationalgeographic.com/kids/
White House for Kids http://www.whitehouse.gov/kids/whlife/index.
Ben's Guide to Government A great source of information about how our government works. It includes many interesting facts about historical documents and much more. http://bensguide.gpo.gov/
WWF - World Wildlife Fund. Do you like animals? Learn about your favorite animals through photos, videos, and fun facts. http://www.worldwildlife.org/species/
Defenders of Wildlife. More animal fun. http://www.defenders.org/programs_and_policy/policy_and_legislation/endangered_species_act/index.php