Oklahoma State Science & Engineering Fair

Science Fair Website Sites:  Sources for project guidelines and ideas.

KidSpace - The Internet Public Library
Science Fairs - You Never Know Where a Science Fair Project Can Take You
Neuroscience For Kids - Successful Science Fair Projects
Discovery School - Science Fair Central
http://members.aol.com/ScienzFair/ideas.htm (broken link)
Cyber Fair - A Resource for & By Elementary Science Students
How To Do A Science Fair Project
Science Fair - Idea Exchange
Dr. Shawn's Super Science Fair Support Center - The Ultimate Science Fair Resource
University Libraries - Science Fair Projects.  A resource for students & teachers.

Other Science Fair Links

Science Fair Handbook Ideas
Science Fair Organizers for Teachers
Science Fair Ideas Exchange
Science Fair Project Guide (Very thorough!) 
NASA Cool Cosmos
This site allows users to research a wide range of subjects, from agriculture to technology

Check here often for news about state and local science fairs.