The new Cards app from Apple lets you create and mail beautifully crafted cards personalized with your own text and photos — right from your iPhone or iPod touch. Take a quick snapshot and with a few taps and swipes, an elegant letterpress card is on its way to any address in the world. Each card is just $2.99 when sent within the U.S. and $4.99 when sent to or from anywhere else. And that includes postage.