If you travel for business, you know how important it is to be relatively comfortable while you fly. For most of us, this depends on choosing our seats well. The long-legged, for example, often prefer to sit in an aisle seat; those who enjoy a mid-flight nap often want the window, where their travel pillow fits perfectly between their shoulder and the wall. And almost no one wants the middle seat, which pretty much guarantees that you'll arrive at your destination rumpled and annoyed, instead of ready to wheel and deal. Fortunately, there's a 21st-century solution to this age-problem.