(Sample link) NASA for middle-school students http://www.nasa.gov/audience/forstudents/5-8/features/index.html
(Sample link) National Geographic for Kids http://www.nationalgeographic.com/kids/
(Sample link) Fun activities - by girls....for girls. http://www.missoandfriends.com/
Fun web based math games for kids www.jumpstart.com
math games www.familyeducation.com
fun math games on-line www.coolmath-games.com
educational games on-line www.funbrain.com