Some see the iPad as an entertainment device meant for watching movies, looking at pictures, and playing games. It's great for idle time on the couch but it has no place on a business person's desk. That is flat-out wrong. Here, author Dave Caolo reveals why the iPad is the business machine you've always wanted. First task is to subdue unruly email. You say you've got multiple accounts, including Microsoft Exchange and Gmail, in addition to Apple's own MobileMe? No problem. The iPad handles those and more.