Inspiring. "It won't work" should be on the checklist for every entrepreneur.
QR code readers are a software (not hardware) install, and they install onto your phone (not PC), which is quite naturally close at hand when your reading off paper.
I'm not saying QR codes will proceed to establish themselves long-term. I am saying that if they don't, that will tell us more about the potential ecosystem for this sort of thing than CueCat's failure did, simply because major usability frictions inherent to the earlier technology are now out of the equation.