Even though this video is taking about K-12 using iPad textbooks I could see the benefit of using the iPad to hold all course textbooks for colleges as well. What is really powerful is that Apple is opening up "iBook Author" to allow anyone to create a textbook for their courses!
http://www.apple.com/education/ipad/includes/video-textbooks.html#video-textbooks
http://www.apple.com/education/ibooks-textbooks/