Read The All-Digital Library Not Quite Yet by Jennifer Howard in the Chronicle of Higher Education's Wired Campus section.
Particularly interesting was "They found evidence of a "container-neutral approach," in which it doesn't really matter how information is packaged, as long as it can easily be found by or delivered to users."
In the not-to- distant future, less emphasis will be on warehousing materials and more will be on desktop delivery and service.