You may like to have a look at a recent article seen on wired at
http://www.boingboing.net/2009/12/11...0-book-sc.html
From the web page: 'Wired has a great feature on grad student Daniel Reetz $300 homebrew book-scanner (David linked to the Instructable for it in April). The device uses a couple of digital cameras, some acrylic and some wood to scan a 400 page book in 20 minutes, converting the scans to text with free software. '