National Geographic for Kids http://www.nationalgeographic.com/kids/
Fun activities - by girls....for girls. http://www.missoandfriends.com/
Scholastic Book Clubs http://www2.scholastic.com/browse/home.jsp
PBS Kids - Games, art activites, music, etc. http://www.pbskids.org
White House for Kids http://www.whitehouse.gov/kids/whlife/index.html