[X4U] Guitar learning apps?

[Mark Des Cotes]

Hi all,

My 11 year old son received a box guitar from his grandfather for  
Christmas. It was unexpected as my son has never shown any interest  
in playing. Now that he has it though he's been fiddling around and  
trying to learn the few cords his grandfather showed him. Right now I  
believe it's more of a curiosity for him than an interest. But if he  
keeps at it, and if he's interested, I will offer to enrol him in  
private lessons. In the meantime, I was wondering if any of you could  
recommend any Mac "tutorial" software that would help him learn to  
play? I'm looking for something that isn't too complicated or too  
expensive.

Thanks

Mark Des Cotes