This is not a software but still unbeaten when it comes to learn sightreading on the guitar :

http://www.amazon.com/Modern-Method-Guitar-Volumes-Complete/dp/0876390114/ref=sr_1_1?ie=UTF8&s=books&qid=1273671744&sr=8-1

These are all 3 volumes. I just worked through the first one completly. And it really helped me a lot. But it is hard work.... as usual when you really want to learn something. :cool:

HP