This coming weekend an interview with Michael Hart about Digital Libraries will be broadcast on NPR [National Public Radio]. In this interview he was also joined by Brewster Kahle (The Internet Archive) and Michael Keller (Librarian of Stanford).
Michael specifically talks about wearing Digital Libraries on a necklace, Terabyte hard drives and creating a Billion eBook Library.
This is also available as a download from;
http://media.libsyn.com/media/sciencefriday/scifri-2007051112.mp3