The Open Library
You may have heard of the Open Library Project. It's an ambitious project with the intent of digitizing every book in existence. Now, obviously, there are issues with books in copyright. As they state on their website:
"The Open Library strives to make materials as openly available as is legally allowed... (They) will rely on Creative Commons licenses to encourage the greatest possible degree of access to and reuse of the materials, consistent with respect for the rights of content owners and contributors."
Currently they are in the process of digitizing out-of-copyright items with the help of such partners as Internet Archive, Johns Hopkins University Libraries, MSN Search, National Archives (United Kingdom), Research Libraries Group (RLG), Smithsonian Institution Libraries, University of California, University of Illinois at Urbana-Champaign, and Yahoo!.
They just unveiled the demo site that gives you a sneak peek at the creation and future of this hefty projection called The Open Library. You can even take a guide tour to get a better feel for this ambitious site.