Apple's new iBooks2 app, the availability of low-cost textbooks from some of the major textbook publishers, and iBooksAuthor for content creating content, might cause school districts implementing a 1:1 environment with iPads to rethink their plans for providing content on mobile devices for students.
Take a look at the textbook titles in the iBookstore (http://www.apple.com/education/ibooks-textbooks/publishers.html). iPad owners with iOS5 can download the free book called "Life on Earth" from E.O. Wilson, to get a sense of the features available in this new format.
See more at: http://www.apple.com/education/#video-textbooks