Bob LeVitus, often referred to as "Dr. Mac," is considered one of the world's leading authorities on all things Apple and he has been one of the Mac community's most trusted gurus for more than twenty years. His most recent titles include: iPhone For Dummies, 3rd Edition, Mac OS X Snow Leopard For Dummies, and Office 2008 for Mac For Dummies. Bob is currently a columnist for the Houston Chronicle, penning the popular Dr. Mac column every Tuesday. He is also a columnist for The Mac Observer. Video: http://www.youtube.com/watch?v=phzG45lRv9Q