Og Mandino - The Greatest Salesman in the World

Greatest Salesman, for those unfamiliar, is basically brute-force brainwashing yourself into positive results/habits.
It has a short introduction and then has 10 chapters or "scrolls" with a new lesson for success on each chapter. You are supposed to read the first scroll three times a day for a month before moving onto scroll 2, etc... The book takes 10 months to read if you follow directions.
He wrote it way back when for insurance salesmen, if I recall, and it became an instant hit and hasn't lost momentum since.
I've used the audio book on my way to/from work at a REALLY painful job (cold calling, low pay, bad work environment) and it really, really improved my mood and attitude while I was using it. It DOES work, regardless of the extremely cheesy content.
It is basically the same technique that Napoleon Hill suggests for auto-suggestion, except the words are given to you rather than setting your own goals.