Khan Academy is a free learning site, hosted by Salman Khan, a graduate of Harvad Business School and MIT. Salman Khan founded the Academy with the goal of using information technology to teach many things in the world. Khan utilize YouTube to broadcast the subject matter is delivered in typical audio-visual form. There is now more than 2400 more video lesson presented in this academy. And another great, Khan himself who made this whole video learning. It's excellent for an MIT graduate who is supposed to work in large companies, but are willing to devote himself to teach what he has to the world for free and certainly interesting. Khan Academy teaches many things, including mathematics, chemistry, biology, history, probability, trigonometry, brain teasers, algebra, economics, banking and money, finance, geometry, statistics, calculus, physics, differential equations. Of course there are many others.
