What's a book you read that changed your life?

The Tightwad Gazette. A friend introduced me to it. I used to be a major spender that ended up in major credit card debt. That book was like my bible when my kids were little and I didnt work outside of the home much living on my husbands pay which wasnt super great. Even with as little money as we had we had managed to save up enough to move to Florida following the TightwadGazette's advice. Even now that my kids are grown I still apply a lot of its strategies and advice to my life.