Check out the EBM (Espresso Book Machine), a device that can print a paperback book, indistinguishable from one printed by a publisher, for about a penny per page (toner, paper, ink, etc.). While perhaps not revolutionary, this device could help bridge the gap between true digital paper (while the Kindle is getting close, I still want something as light and easy to use as the traditional book) and the legacy publishing environment. Libraries could certainly use one of these to print out books instead of ILL requests ... but will all of the publishers support this device. Online booksellers could certainly use this device ... saving on inventory and providing a greater catalog of available titles. Unfortunately, only 200,000 public domain titles are currently available ... publishers will need to support this device in order for it to get greater acceptance. Currently, this will be a good fit for academic institutions; smaller libraries and organizations probably won't be able to afford this technology.
Read more about it (be sure to watch the video) at: http://www.ondemandbooks.com/ .