National Council of Teachers of Mathematics
The Math Forum: Math Ideas for Science Fair Projects
Math Forum provides a list of possible math science fair topics with links to each topic to get an idea of what will be studied and suggested questions to answer. This site also contains links to teacher discussions on Math Fairs.
Discovery Education
Discovery Education: Science Fair Central: Getting Started
Students needing help getting started with a science fair project can find help choosing a project type, deciding a topic, gathering resources, and brainstorming. This site also includes a handy "Science Fair Shopping List" that contains...
Massachusetts Institute of Technology
Mit: Engineering: Ask an Engineer
This resource is composed of student questions for engineers, and provides information on a variety of scientific topics such as devising science fair projects, planning scientific experiments and getting into a school like MIT for...
Discovery Education
Discovery Education: Science Fair Central
Are you, your students, and their parents wandering lost in the Science Fair desert? Here's an oasis! The Science Fair Central website provides a complete guide to the topic. There's a "Soup to Nuts Handbook" that assists the student in...
Other
Science Fairs Homepage: Senior Projects
This resource from the Eastern Newfoundland Science Fairs Council provides really substantial projects for senior High School students. These are online topics, six areas, with about 10-20 topics per area.
PBS
Pbs Kids: Dragonfly Tv Science Fair: Plan
So, you've chosen your topic and done your research, now, you need to plan your investigation. PBS site walks you through some steps to help guide you through the planning process.
Other
Buzzle.com: Science Articles
This website provides information on a wide range of science topics, as well as some ideas for experiments and science fair projects. It's a good resource for students doing research.