What a fantastic idea, and so obvious when someone else does it first:
The Nebraska Library Commission has begun to include Creative Commons licensed editions of books in its catalog -- so you can check out my novels in the Tor editions, or just nab a copy from the library's site.
(says Cory Doctorow on Boing Boing)
I've just asked our catalog department to do the same for Doctorow's and Lawrence Lessig's Creative Commons licensed works (since I knew about those off the top of my head). I'll ask for more as time goes on, of course....