SpeechTracker is a simple, effective (and free!) app that allows you to practice speech therapy from your iPhone. You can use it anywhere or anytime.

You simply specify the words or phrases you're having difficulty with, and it generates practice sessions on the fly. It can generate an infinite number of practice sessions so you'll never get bored.

SpeechTracker is a huge improvement over the usual methods, like reading instruction manuals. It is highly targeted and efficient.