(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/
Math site - decimals http://www.aaamath.com/dec.html
Weather games http://eo.ucar.edu/webweather/games.html
Many available printable activities for different subjects and holidays http://www.abcteach.com/
Online math fact activities http://www.lizardpoint.com/math/mathsheet.html
Fractions - visual fractions http://www.visualfractions.com/
Visit McGruff and help with child safety issues through games http://www.mcgruff.org/games/
Citizenship stories through books to read on line http://www.lsuagcenter.com/4hcritters/images/readastory.htm
Studying the body? Visit this! http://yucky.discovery.com/flash/body/pg000123.html