There's also Finale PrintMusic, which costs $60 - $90, depending on where you get it. (Try Amazon).
I've demo'd it, but haven't used it to do exactly what you describe. But it claims to allow scanning of printed sheet music, and it also claims to generate tab "automatically by dragging standard notation onto a Tab staff".
http://www.finalemusic.com/printmusi...s/default.aspx
It's probably not as easy as it sounds (nothing is particularly intuitive about Finale), but there you go. Find the 21-day free trial download.
