Archive.org has taken on the project of physical preservation not only of the digital representation but of the books they scan:
http://blog.archive.org/2011/06/06/w...ernet-archive/
However if it was not in print form to begin with, seems there might be some problems if we lose the ability to build technology for reading the digital content, even if it is physically intact.
No doubt someone is thinking about how to re-boot digital technology in the event of civilization crash, if only the sci-fi writers. Hopefully this effort will not involve the reinvention of MS Windows, we should not repeat the mistakes of the past. (just kidding, Microsoft).