Outliers, definitely the freakenomics books, I enjoyed Rich Dad Poor Dad, The Lean Startup, Power of Habit, Defining Decade (if your in your 20's, fantastic book), The Happiness Advantage, Great by Choice from Jim collins...
Thanks! From that list, I've read Outlier, The Lean Startup, and Power of Habit. Currently reading A Short History Of Nearly Everything, and I plan on following that with Zen and the Art of Motorcycle Maintenance. After that, I will probably jump on Defining Decade.