Thank you for using the Jiskha Homework Help Forum. Here are some:
3. (some annoying pop-ups): http://www.all-science-fair-projects.com/category89.html
4. (good one for high school): http://www.sciencebuddies.org/mentoring/project_ideas.shtml
There are still more sites if you don't find anything here.
Thanks so much. I have to check them out tomorrow tho cause I couldn't get back on till late.