There's also a battle going on with Amazon and their electronic books.
If you think about it..this is the same sad story that happened when music first became digitized and available over the net.
Everyone wants their share of the pie.
And you can buy e-textbooks outside of either Apple or Amazon. College bookstores now offer them online for purchase and immediate download.
Here's an example from Austin Community College (Texas):
http://austin.bncollege.com/webapp/w...atalogId=10001