The site explains its mission:
Kids learn best by "seeing" the world. Here’s the best selection of free online educational videos and lessons from all over the Internet.
Site managers note that all included videos have been reviewed and screened by K12 teachers and encourage viewers to rate videos for grade appropriateness.
The very simple interface includes a topic browse and search box. It lists videos you’ve recently watched, and it features an interesting video of the day.
Share this before summer break or at an early faculty meeting. And when you do, teach about the wonders of embedding!