photo credit: author of this blog
This form of barcode is meant to be scanned by a smartphone. Once scanned, it can produce coupons, web links for further information, online demos, and lots more.
As someone who doesn't own a smartphone, I'm intrigued by QR codes and their increasing ubiquity. It is possible for libraries to capitalize on the rising popularity of QR codes; some have already taken steps in doing so. But according to Emily of the blog Emily's Notebook, some libraries are doing it wrong. See her post below.
Emily's Notebook * November 7, 2011
Libraries and QR Codes: You're Doing It Wrong
What other creative ideas can we come up with? Let’s get the QR’s out of the library building and into the world where people and their smartphones actually live!