WatchKnow

WatchKnow is an initiative by Dr Larry Sanger, the co-founder of Wikipedia. It is a collection of online videos for education K-12. The beauty of WatchKnow, as opposed to other video sharing and collection websites is that you can collect videos from many sharing sites on the internet for example YouTube, SlideShare, Google Videos, Vimeo - to name a few.
WatchKnow has indexed over 20,000 educational videos, placing them into a directory of over 3,000 categories. The videos are available without any registration or fees to teachers in the classroom and to students at home 24/7. Users can dive into the innovative directory or search for videos by subject and age level. Video titles, descriptions, age level information, and ratings are all edited for usefulness. The Web site invites broad participation in a new kind of wiki system, guided by teachers.
So why not create a class, a grade or a specialist area page in WatchKnow Classroom and add all the videos and slideshows that you will use in your teaching. Alternatively organisations such as the library can start to create a repository of videos that the whole school can use. There's an introductory video on this page to get you going.
This is a very exciting initiative and one which is set to grow to 50,000 videos.