Sure, you meant to send Grandma and Grandpa a postcard from your recent vacation. But the process of selecting a postcard from a rotating rack in a souvenir shop, penning a message, obtaining proper postage and popping said card into a mailbox feels like a lot of work when you could just send a picture from your smartphone. At the same time, there really is something special about getting an actual postcard in your mailbox.
Enter Postino. You snap a picture, add a message (including your real signature), buy a stamp through PayPal and your real postcard arrives in a real mailbox in just a couple of days.