Here are sites for you to explore when trying to decide on a science fair project.

Science Fair Projects, Ideas and Tools
This looks like a great site. You can go through a wizard and answer many questions about your interests and it will help you find a project. It also has lots of helpful tips for completing a project.

Science Fair Sanity
Projects for 3rd-5th grades to download.

Discovery Education Science Fair Central
Ideas and steps to follow for a succesful project.

Science Bob Fun Experiments
Fun and easy experiments and demonstrations.

Internet Public Library
Science Fair Resource Guide

Science Fair Toolkit

Science Made Simple
Ideas, topics, methods, and examples