The advertising world is becoming overrun with QR codes and they are usually used pretty poorly. Love them or hate them, QR codes do sometimes serve a valuable purpose—if your audience is technologically savvy smart phone users and if you want to drive them to a website that might be cumbersome to type into those smart phones. Most QR code uses don't fit those criteria, most of the time it seems like ads with QR codes fall into the "so we can say we did it" reasoning.
Ads of the World a couple days ago. Otherwise you easily fall into the realm of marketers that have suddenly discovered they can scan ugly bar codes with their phones. How novel.