I listened to the Wesley Fryer interview Rustin Hurley and was very impressed with what I heard. I excitedly checked out all 3 sections of New Vista. The concepts behind the site are the answer to many a teachers prayers. (Oh...btw...I tried to put my response in a easily readable chart copied over from word...big failure. The formating did not transfer...so now I'm resorting to cumbersome text.) As far as educational content and relevance: I found that it didn't provide much for my content area. Even the global review was too limited for my course content. It was easy for teachers & students to use and holds lots of possibilities for the future when it has a wider, deeper database of materials.
Teacher Tube: This has possibilities but will require significant time investment to find material that will be useful for topics being covered in my classes. I found the ads to be annonying and interfered with my enjoyment and satisfaction of using the site. I was grateful for the search feature to help winnow out material. I think students would probably like using this site. I myself got sidetracked with a video titled, "Pull your pants up". Much to the annoyance of my own teens, especially when I became inspired to rap and dance along!
School Tube: This also has possibilities but I felt that the time investment to find that "gem" that was a good match was considerable. While easy to use for both students and teachers, perhaps it would be a good student assignment to have them locate material based on some carefully structured guidelines. It certainly could provide students with good ideas for a project of their own.
U Tube: While this medium is universally used, I prefer to go to news sources for video that I can use in my class. Then I'm confident of the accuracy and quality. I find it easier to use the search tool and get direct hits for content that I am seeking. However, since students love to use u-tube, teachers have the benefit of a "built in hook". Structuring assignments carefully could yield some great creativity for student generated videos.