Ive been reading the Horizons Report on the up and coming technologies to watch. One of the technologies they mention is e-books. Now the benefit of e-books is that they save paper and are pretty mobile you can take them anywhere.
Now if you where to treat it as a e-learning course and have the text along with interactivity then user might receive a better learning experience. The old books used to have mutliple choice questions at the end so lets make e-books more interactive.