Do you have a plan for making books that are currently copyrighted available for download? Will it be limited to public domain/CC licensed books?
Is there any way that I would ever be able to borrow one of the Harry Potter books from your library? Are you focusing on cataloging the information about books or are you focusing on making books available to people?
You should really read the Open Library site for the best idea of what its ambitions include. (Just as I'm not speaking for the Internet Archive, where my project is web archiving, I'm not speaking for the Open Library, either.)
Is there any way that I would ever be able to borrow one of the Harry Potter books from your library? Are you focusing on cataloging the information about books or are you focusing on making books available to people?