One of the most useful — but likely misunderstood — new features introduced in Apple's iOS 6 software for the iPhone
is called Passbook. At first glance, the app might even seem like it
doesn't serve a purpose. While it might not exactly be well-explained,
it can simplify the process of keeping track of various passes — such as
tickets, coupons, and gift cards — once you know how it works. S...