I know this was mentioned in another thread about hardware and camera but it looks really promising and may be a good resource to keep an eye on. It is called Decapod.
http://sites.google.com/site/decapodproject/
This is what they are aiming to do in their own workds "Decapod will be an inexpensive attaché case sized hardware/software solution that can be readily procured and assembled and taken into the stacks or out into the field by local staff or volunteers to quickly and unobtrusively capture the material and deliver it in usable format. It will be open-source, easy to use, and will provide an out-of-the box method of digitizing small to medium archives of scholarly material. Decapod will remove the barriers to digitization now encountered by archives of documentary material: cost of equipment, cost of labour, lack of digitization expertise, lack of suitable distribution formats, and lack of acceptable remediation workflows. Decapod will address them all to produce a paper-to-digital document solution that is highly effective, highly automated, and low operator interaction (apart from page turning)."
Decapod
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