Breaking it down does seem like a good idea. Breaking it down would bea low barrier for people. I also had an idea about adding something that would take the most popular videos of the day/week/whichever to send out for people to transcribe.
I've been looking through Amara's python code and trying to reverse engineer some things. They create a separate class for each type of video, so we'll have to look into the different APIs besides YouTube for Vimeo, Yahoo, etc.