If you've ever been to the LOC (or done fieldwork in places where photocopies are costly or otherwise limited), you may have thought about dragging along a scanner to make digital copies (I even have a nice case for mine).
Welcome to the new world. Snapter converts snaps to text, with a nifty perspective adjustment that even supports open-faced books. Priced at $20 or $49, it's a cost-effective alternative to schlepping a scanner around.
I imagine a very clever person could find a way to automatically send hi-res cellphone snaps to an archival location, for backup.