YouTube EDU: YouTube, which is owned by Google has started a separate section catering solely to education. It is a collection of channels of many colleges and universities and contains video lectures from these colleges and universities.
Presently, YouTube EDU is only offering their service to qualifying two- and four-year degree granting public and private colleges and universities. Hopefully, they will soon extend their services to K-12 schools also. It will be really great if K-12 teachers could have a platform where they did not have to worry about the content of the videos that are displayed. Although, presently, they can always use TeacherTube as a great alternative. It caters specifically to educational videos.
This new venture is a result of Google's 20 percent concept, which is part of Google's philosophy, where employees use 80% of their time working on their designated work and 20% of their time on projects that interest them. Many features of Google and many products launched by Google have been the result of this 20 percent time.
Listed below are two articles about YouTube EDU:
YouTube EDU launches.
YouTube EDU Brings Free Education to the Masses.
Another site mentioned in the second article listed above is Academic Earth, which also contains a database of lectures from various educational institutions. This is also a great resource.