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There are several online repositories for teaching and learning videos. Here are a few. If you know of others please let me know and I'll add them to this list.
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Watch Know Learn

http://watchknowlearn.org
Search for a video and this site will look for it in TeacherTube, SchoolTube, YouTube, Vimeo and more. Kind of like One-Stop shopping!


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KHAN Academy

http://www.khanacademy.org/
Math, Science, Humanities & Others, and Test Prep are the categories of videos that can be found at the Khan Academy. Many teachers are using videos from Khan Academy in their 'flipped classrooms.'


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Teaching Channel

https://www.teachingchannel.org/
This site is a video showcase of inspiring and effective teaching practices in America's schools.