Science Fair Projects
These sites might help you find ideas and get some useful tips!
(There are tons more on the internet.  These can just get you started)

Encarta Science Fair Projects
http://encarta.msn.com/sidebar_701509750/Science_Fair_Project.html

Discovery Channel Science Fair Central
http://school.discovery.com/sciencefaircentral/

AOL @ School Science Fairs
http://www.aolatschool.com/science-fairs

Internet Public Library guide
http://www.ipl.org/youth/projectguide/

Science Fairs
http://www.stemnet.nf.ca/sciencefairs/

Successful Science Fair Projects
http://faculty.washington.edu/chudler/fair.html

Steps to Prepare a Science Fair Project
http://www.isd77.k12.mn.us/resources/cf/steps.html

SCIENCE FAIR IDEA EXCHANGE (includes links to more places for ideas)
http://www.halcyon.com/sciclub/cgi-pvt/scifair/guestbook.html

Science Fair Project on the web
http://sciencefairproject.virtualave.net/