Math Fair Links
North Carolina Council of Teachers of Mathematics Math Fairs Page - Information on State Math Fairs and winners from last year
Science Buddies - Ideas for projects that have been done in the past.
Math Fair Project Idea List - Provided by the Eastern Region NCCTM directors
Henderson Elementary's Math Fair - These are ELEMENTARY projects but may give you an idea!
Education.com - Ideas of science projects that have math in them!
NCAEE - Describes what math fair is and how to come up with a topic.