NASA for middle-school students http://www.nasa.gov/audience/forstudents/5-8/features/index.html
National Geographic for Kids http://www.nationalgeographic.com/kids/
By girls....for girls. http://www.missoandfriends.com/
Mrs. Lorah's website http://www.teacherweb.com/pa/ststephens/lorah/
Mrs. Sweeney's website http://www.teacherweb.com/PA/ststephens/MrsSweeney/
Cool Math - games and flash cards!! http://www.coolmath.com/