Omnisio is an intriguing site that allows you very easily edit videos that are on YouTube, Google Video or Blip TV and create your own version of them. What’s more interesting to me, though, is its comment system. Once you create your video, people can write comments directly on the video itself and at whatever point the writers want it seen.
Graspr is another video site I’ve posted about that has a vaguely similar commenting system, but Omnisio’s appears far more advanced.
For classes with English Language Learners in schools that don’t block those three video sites (and I suspect they are few and far between) it might be worth experimenting with Omnisio. Students could create their own videos and, more importantly, comment on the others created by their peers.
I learned about Omnisio from TechCrunch.