Long time readers of Have Fun Do Good probably already know about the 29 Day Giving Challenge created by my friend, Cami Walker.During the 29 Day Giving Challenge, you give away one thing each day for 29 days. It can be anything: time, money, something you already have, something you buy, a smile, a compliment, or a kind word.What you might not know is that since I first wrote about the Challenge in April 2008, Cami has published a New York Times bestselling book, 29 Gifts: How a Month of Giving Can Change Your Life, and has appeared on the TODAY Show! Pretty cool, huh?I've completed the…