The name of the program that can work in tablature is Guitar Pro. The information I've found is at www.triplets.com/gp/
I don't know if it'll actually work with a scanner, but from what I've seen, it would be a good program for those that don't read music very quickly.
My music reading ability is piano based (which is stupid because I'm a guitar player), so I have a hard time converting between tablature and regular music.
This program can apparently convert between standard sheet music and tablature. I have no idea how it is able to do this effectively since most notes can be found in multiple places on a guitar's neck.