If you ever want to learn to play guitar, head over to JustinGuitar.com. I've heard great things about the site from guitarists, and the whole site is packed with free tutorials, advice, and practice guides.
Guitar Practice for iPhone is also free! This is an unaffiliated app, but is intended to be a companion to the site, and Mahalo's Guitar Lessons with Jen Trani free video series.
Guitar Practice iTunes Description:
Guitar Practice is a companion app to your learning to play guitar. You can follow Justin Sandercoe's practice schedules for beginner and intermediate guitar lessons on JustinGuitar.com along with this companion app to time and log your sessions. You can add songs you're learning and the app can turn the songs' chord progressions into one-minute chord change practice sessions. You can create your own custom practice sessions. All completed sessions are logged. You can also write in your goals for your practice.
Visit JustinGuitar.com and Mahalo's Jen Trani on YouTube for great guitar lessons and song tutorials. Check out this app to time and log your practice sessions as you go. Guitar Practice is not affiliated with JustinGuitar.com or Mahalo.com.