There are a number of tools for doing this. HP ships a package with at least some of their OfficeJet machines that does a respectable job. I'm pretty sure that Cannon does too, although I've never played with it myself.
Intel used to have a great product that they shipped with their SatisFAXion boards, that I think they've released as a commercial product. I don't know the name off the top of my head, but it was a great package (easy to use, accurate, and relatively low overhead).
I suspect that this market has already been pretty well developed. I'd be surprised if there was much room for real growth here.
-PatP