I've got to do a Science Fair project for school, and I need to know if there are any good sites out there, housing a few good experiments. I've Googled it, and come up with only "Safe but fun volcanoes" and "Vinegar and Baking Soda Fun!", and that's not quite what I need.

Although any help is appreciated, I would prefer stuff you can build, and not just stuff you can research.

I have always been a fan of generators and motors. You can put a magnet in an electrified coil and make it spin. That is a good example of how motors work and of electromagnet force. You could also arange a spinning magnet (use a crank and some gears to get it spinning fast) in the same arangement and produce electricity, use it to light a christmas bulb or something.