Terry Anderson's second edition of his book on the Theory and Practice of Online Learning is now out. This is an excellent resource for learning about online learning. And it is available as a free e-book.
If you are teaching a course about online learning, you may want to consider using this as your textbook. Students can buy the hard-copy if they wish or they can save the dollars and download it.
Terry Anderson is a Professor in the Centre of Distance Education at Athabasca University and he holds a Canadian Research Chair in Distance Education. Click here to go to his online portfolio. Terry also posts to a blog or two. Check out his Virtual Canuck Blog at http://terrya.edublogs.org/