Actually MIT's OCW is pretty popular and many people know about it, but I am sure there are other sites as well which have quality tech education type material, some of the links I use below, What other links do HNers have?Please pass along here and everybody could gain from that

1) MIT -> http://ocw.mit.edu/OcwWeb/web/home/home/index.htm

2) National Program on Technology Enhanced Learning ->http://www.youtube.com/user/nptelhrd

3) Google Tech Talks -> http://www.youtube.com/user/googletechtalks