In one of our online courses the instructor has a conference call each week with his students. They discuss the week's activities and he provides explanations on topics that students consider confusing. It is a course in business law so having that place to "hash out ideas" is very helpful given the course is very heavy.
Using the phone is quick and easy and students have an opportunity to hear "real" voices. I think it has worked well in this context and is something to keep in mind as an option.
I get the impression that the students feel re-connected and refreshed after each Thursday session.
I think it is important to remember that YouTube is not just about posting videos but a lot of those videos are *responses* to other videos. In this way it is dialogic and conversational. Still it doesn't quite capture the quaternity (is that the word?) that you have described elsewhere.
Another approach is the one found in voicethread. If you haven't seen it, check out http://voicethread.com. There the initial object sits in the middle (which could be something started by the teacher or a student) but then it gets surrounded by comments, which can take the form of audio, video, or text.
It might be a useful tool, or if not a tool to use perhaps a model for other tools.
So everyone, please introduce yourself using audio, text, or video. Post your thoughts on this seminar topic, ask your burning questions...
Howard Gardner's Multiple Intelligences theory seems to address this best, imho - he also includes Naturalistic intelligence which incorporates nature and ways of knowing related to the planet; Musical Intelligence, Inter and Intra personal intelligence, and so on...all seem very applicable when considering First Nations pedagogy.