In this brave new world in which we find ourselves, the iPhone has emerged as a kind of new type of digital Swiss army knife. It always has another tool ready to save the day. With the economy still somewhat topsy-turvy, a timely e-coupon can be a good friend indeed. Enter these four fabulous money-saving apps. Collect and use all of them, each e-coupon provider has their own unique values. What’s really cool is the new bar code that is scanned into your smart phone and magically brings you to your savings for each individual offer.