I think we'll end up with some planned and edited screencasts, and some "live coding" streams that are great (with 95% of the live streams being dull.) So there would probably need to be some kind of reputation system or way to look for coders who happen to be interesting in this format.
There are some really good screencasts out there -- I watched some of Kent Beck's Test Driven Development videos and learned way more than I did from the book. (http://pragprog.com/screencasts/v-kbtdd/test-driven-developm...)