This nifty tool lets you gather web videos together and store on one spot and thus link. I have had trouble embedding too many videos in a wiki, and this seems like a solution.
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Classroom ideas: Search for and then retain videos that will help you teach a certain subject. I like this idea because you don't have to search again. The buffering time seems less here, too. Here is a selection for making origami. http://worldtv.com/joantv/.