Educational TV -- know of any?

Hi,

I have put up a Teacher's TV page of available public TV streams on our ning. All part of my goal to really fuse both social networking and content (access to knowledge/technological applications). I have a good variety and only reliable streams. Please take a look and there is lots more for teachers who deal with literacy - a story and game web directory. Click and play. Plus karaoke and videos.

But my question - do you know of any educational video streams/channels that are public or really stellar?

Thanks,

David
http://eflclassroom.ning.com