I recently found a great app for my iPod...However, it is also available for smartphones as well, like my DroidX...It's called Nike BOOM! and it seamlessly merges your selected playlists and inspirational messages from top athletes and coaches from a variety of sports. It is also able to be synced with your facebook account, and if a friend "likes" you workout or gives you a supporting message, it comes through right as you workout. I am in the recovery week for P90x, so I am hitting the elliptical pretty hard...This BOOM! app is really great, and very motivating...I encourage all of you to give it a try! It is available in the ITunes store, and the Android Market Place...It's great!