YouTube Crash Course - Six awesome courses in one awesome channel: John Green teaches you US History and Hank Green teaches you Chemistry. Check out the playlists for past courses in World History, Biology, Literature, and Ecology.
Google Cultural Institute - Explore Art from Around the World. Google has partnered with hundreds of museums, cultural institutions, and archives to host the world’s cultural treasures online.
Kahn Academy - Learn about math, science, finance, SAT prep, history, art all free. There's even exercises that will give automatic feedback and you can use your Google Apps account (@share.wilsonsd.org) to sign-in and save your progress.
PBS Learing Media
Watch Know Learn - Free educational videos organized
Gooru Learning - free learning materials can be found, rated, remixed, and shared.
Google Helpouts - Real help from real people in real time
HippoCampus - a free, web site that delivers rich multimedia content--videos, animations, and simulations--on general education subjects to middle-school and high-school teachers and college professors, and their students, free of charge.
Thinkfinity - search engine for educational materials
Internet Archive - Its purposes is offering access for researchers, historians, scholars, people with disabilities, and the general public to historical collections that exist in digital format.
Jason Learning - Education through exploration. Connecting students to real science and exploration to inspire and motivate them to study and pursue careers in Science, Technology, Engineering and Math (STEM).
21st Century Learning Videos