The Croatian Postal Service (Hrvatska Pošta if you want to get technical) has recently released a new QR code stamp. The stamp was created to celebrate the country's 20th year of stamp-issuing and is designed to help people track the location of their letters and packages.
The QR code stamp informs folks of the location of their mail during every step of the delivery process. Senders can check the locations of their letters online and can even receive delivery confirmations. One of the hardest parts about using the postal service is not knowing of where your letter/package is and when it will arrive. A QR code stamp could help ignite some enthusiasm for snail mail and encourage more people to send letters and packages. UPS, don't sleep on this one.