I am all for sharing resources. I don’t use the more public venues like TeacherTube or Flickr but I have sourced a lot of my materials from youtube, mostly from affiliated schools but also from TED talks. A lot of the video I use, however, is from footage of my own programs and therefore of my students. I don’t know how I would feel about others remixing those videos for other purposes. I would say yes to reuse, but no to remix.