Square is one of the coolest accessories made for the iPhone. It's a hardware/app combination that, when the hardware bit is plugged into the headphone jack on the iPhone, lets the user accept credit card payments.
Simply swipe the card through the Square device while running the Square iOS app and your customer's credit card is charged in moments. Beginning yesterday the Square Credit Card Reader became available on Apple's online store and, according to TechCrunch, it will be appearing in
