I just stumbled (thanks to RR) over Arena for Books. This is a design challenge with the task to …
“Develop futureoriented and viable ideas for the physical presentation of digital publishing products and services in bookstores and at trade fairs.” Source: http://arenaforbooks.jovoto.com/
… by the Börsenverein des Deutschen Buchhandels (German Publishers and Booksellers Association) and others. Between all the ideas are various interesting approaches of digital shelves such as the Bookshelf 2.0:
Update: Now I realized that the Bookshelf 2.0 is the winner of the challenge. Buchreport published an article about it.