(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/
SCIENCE FAIR PROJECT RESOURCE GUIDE http://www.ipl.org/div/kidspace/projectguide/
more science fair help http://members.ozemail.com.au/~macinnis@ozemail.com.au/scifun/projects.htm
http://www.academics.uc.edu/sciencefair/