ESP recently updated the "ESP Guitar Experience" iPhone app, and it's better than ever! FIRST: through the end of December, the app is only $1.99. What do you get for that low price? How about a chromatic tuner for guitar and bass; a bunch of lessons from ESP artists like Gus G and Alexi Laiho; exclusive footage and interviews of ESP artists and bands; and much more!
It's compatible with iPhone, iPod Touch, and iPad (v3.0 and higher).