The Khan Academy

This is a website that has lessons in everything from basic addition to calc. It's all free and is very well-known and respect, my mother saw it on the news-hour and showed it to me. I thought it may be helpful to some of you:
http://www.khanacademy.org/

It is also a prime example of what Jojo means when he talks about the digital age and the wonder that is the internet...

-Luke