Discovery Channel School: Science Fair Central http://school.discovery.com/sciencefaircentral/
Dragon Fly TV includes a �Super Science Spinner� to help you pick a topic, as well as �Simple Steps to Science Fair Success� http://pbskids.org/dragonflytv/scifair/index.html
Agricultural Ideas for Science Fair Projects http://www.ars.usda.gov/is/kids/fair/ideas.htm
Lots of practical advice on conducting science projects by the Society of Amateur Scientists http://www.scifair.org/
Plans, instructions, and assistance for kids' science projects http://scienceclub.org/
Fun link with experiments! http://www.tryscience.org/home/index.html