The iPad is here. And it's here to stay. There is a sea change going on within the mobile computing industry. And despite the cool, slick look of these devices, it's not the hardware that makes them useful. It's the applications (apps). Apps are little engines of innovation driving the current (and future) trends in computing, publishing, print, and media. There are apps for everything you can imagine. In fact, the latest count shows there are more than 250,000.