There's an in-depth article on (the need of) book scanning in the NYT today:
http://www.nytimes.com/2006/05/14/ma...gewanted=print
"In a regime of superabundant free copies, copies lose value. They are no longer the basis of wealth. Now relationships, links, connection and sharing are. Value has shifted away from a copy toward the many ways to recall, annotate, personalize, edit, authenticate, display, mark, transfer and engage a work. Authors and artists can make (and have made) their livings selling aspects of their works other than inexpensive copies of them. They can sell performances, access to the creator, personalization, add-on information, the scarcity of attention (via ads), sponsorship, periodic subscriptions -- in short, all the many values that cannot be copied."