Still wondering what to do when you grow up? Melissa Plaut isn’t. She gave up the corporate life to become a New York City cab driver at the age of 29. Melissa Plaut will join us this hour to discuss her first two years as a cabbie. Her new book about the experience is called “HACK: How I Stopped Worrying About What to Do with My Life and Started Driving a Yellow Cab” (Villard, 2007).