Tim Ferriss (author of the 4 Hour Workweek) recently posted a great list of "stressful and common habits that entrepreneurs and office workers should strive to eliminate." My two favorites: 1. Do not answer calls from unrecognized phone numbers (I never do) 4. Do not let people ramble (I almost always answer personal calls with "Hey, what's up?" and business calls with "Hi, what can I do for you?"