I believe that all four of the video share sites are helpful/useful in their own way. It depends on what you are searching for and the user that is conducting the search. As a teacher in the visual arts all four have their benefits.
Youtube, obviously, has the largest content base but you need to do a lot of searching through subjects and proofing the videos for the specifics as some sound appropriate but are not. Teacher tube provides a variety of subject matter that is definitely appropriate in content but the selection is not as vast. Next Vista has the potential of being great but is so new and probably not as well publicized therefore the information is sparse. It could take some time to build up a reference base that would be beneficial to teacher and student needs.
As parent, student or teacher the availability of these sites can be a goldmine of information. Just as Wesley Fryer commented in his podcast, Moving At the Speed of Creativity, students can access information and learn the pieces they may be missing without drawing attention or learning on their own time. Teachers could use these sites as assignments for research possibilities, or as resources in the classroom as visual cues instead of always written or verbal transfer of information. I know that I have often used videos from YouTube to demonstrate lessons or generate examples to encourage student motivation.
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