My dad sent me a link to a fascinating article about the project to digitize every book in the world. It explores not only the practical "how," but also the "why" and the "why not." I know most of you are probably not riveted by discussion of copyright law, so here's your warning.
It is a long article, but very well written. (It's a nytimes.com article, so I hope the link works.)
Scan this Book! by Kevin Kelly