My New Year's post was about how John Kitchin used Emacs and Org-mode to run a graduate course in Chemical Engineering. If you want to see it in action, he's posted a short video that shows the system from both the students' and instructor's point of view.
I love seeing how people leverage the Lisp Machine aspect of Emacs to solve problems having little to do with editing text. If you like it too, be sure to check out the video. It's only six and a half minutes to you won't have to schedule time.