A worldwind tour of Drupal implemetations in libraries:
University of Fairbanks Moviebank. A drupal powered platform that links in catalogue info with amazon & rotten tomatoes to search the movie collection. Built on a 4.X platform!
University of Mississippi - Gov't Docs portal, & Subject Resources.
University of Rochester - Total site redesign, currently in alpha.
London Public Library - powers the main site.
McMaster University - Digital collections portal