Learning Online

I just found this site called Academic Earth where you can watch lectures online.   We’ve talked a bit about learning onine via programs like Second Life, and that a lot of universities are podcasting several of their lectures so I thought this would be an intersting link to share.   I wonder if lectures will ever be produced and then aggregated on a website with the sole purpose of being an online lecture.   For the most part, I think lectures that we see online now are already being delivered to some part of the real world and thus doesn’t really require any extra work to publish them online.