This website features Science Project Ideas and Tips for students of all ages. Search for ideas based on a particular area of science, level of difficulty, cost, time, and materials needed. Also available: "Ask an Expert" service.
Check out education.com's list of science fair projects and science experiments for high school students.
Use the Internet Public Library's Project Resource Guide to help you at every step of your project, from finding a topic to figuring out how to display your results!
More project ideas AND a guide for choosing an effective project topic.