We had clips of partial videos (i.e. 5 min out of 15) on Joost awhile ago for a "media trial" and it came with mixed results. It helped a little bit to have more people become aware of Edge, but if we were to re-host all of our videos in multiple locations it would dilute the search engine results and separate people from the community/source of the content here on Edge.
On that same note, however, we are looking into other syndication options where the content is actually sourced from Edge itself.