Hi,

forgot about this one http://www.1manband.nl/notereading/index.htm

This software may be of interest to you also, there's a demo available , so try before you buy. http://www.1manband.nl/busker/index.htm

where it could come in handy is being able to listen to a song before you practice.
You don't have to be able to read ( though it helps) just need to type in the notes / chords by following what's on your sheet music.

best wishes
Rikki