A few months ago, David and I thought it would be a great idea to film some math videos to help people out. We were giddy about this until we came across a website called the Khan Academy.
Talk about a cool website! They have free math videos for everything from addition through Calculus III. They also have places where you can go practice math problems. It's amazing!
If you are of the mathematically-inclined type, you can volunteer on the site, which is a pretty cool gig. I haven't tried it out yet, but I plan to sometime in the near future.