The Khan Academy is a not-for-profit organization with the mission of providing a high quality education to anyone, anywhere. Salman Khan has produced over 1,100 videos on YouTube covering everything from basic math to statistics, biology and physics.

Millions of people (about 8MM) around the world have tuned into his channel for free instruction, and in a way that can be accessed on-demand at a student's own pace. According to Khan, 70,000 students visit each month and watch 35,000 videos a day, with 2 million minutes of instructional video delivered in the past week.

Other non-profit groups have started distributing off-line versions of his library to rural and underserved areas in Asia, Latin America and Africa. It’s amazing how the Internet is helping to democratize education. No longer will proximity to “good” schools and deep pockets prevent people (mostly in developing worlds) from learning. 

Other educational video destinations:

YouTube Edu

Open Culture