I have been looking for this for a long time. It is TeacherTube.com
Teachertube.com appears to be a youtube for educators. You will note the note that notes " Keep it SAFE! Flag all Inappropriate Videos"
According to the "About Us" at the bottom of the page, Teachertube opened March 6, 2007 so it isn't even a month old. It was put together by a teacher.
This is where teachers can upload their instructional videos or videos of them instructing. What a WONDERFUL resource for professional development!!!!
Here is a video that shows how technology can help educators dance through the day.