Not a quick read, but it is definitely well worth it. The 7 habits put your behavior into perspective, and helps you understand where you've being failing.
Life doesn't come with a manual, and we all go on with continuing our habits, good or bad, the way we have always done, and the way we always believe was right. When you put your habits against those of people who are successful is when you learn what you've being doing wrong all along.
Quick list of the 7 habits:
Certainly one of those life changing books, that will put your life and habits through a new perspective, preparing you for a much brighter future if followed. I highly recommend!