It's new and it is in a 'beta' state; however, Academic Earth is something to keep your eyes on. Currently, it offers thousands of post-secondary lectures from authorative sources - all free. The creators of this repository have worked hard to integrate features into it that make it extra useful. Each lecture has a side bar with a slection of special options, such as a download to iPod option, a citation option, an 'embed' option that gives you code you can copy and paste into your website (this means that you can distribute the video to your students without having to host the video on your server. Nice!). Each lecture is rated by registered users of the website (registration is free!). So over time, the most highly rated lecture will float to the top. While in the 'beta' state, Academic Earth strongly encourages users to leave feedback on any bugs you find as well as to make suggestions on how to improve the service. At the time of launching, it is billed as "Thousands of video lectures from the world's top scholars." Not bad for a start, where will it be a year from now! What do you think?
Photo credit: Here.