This might be more of "High School Library" post, but here goes:
Affixing a QR code to the back of a library book allows students to view reviews, or an author website or booktrailer (whatever you choose) right from their phone. You could even post a couple of QR codes on your website, or on the door to the library.
A QR Code is a specific matrix barcode (or two-dimensional code), readable by dedicated QR barcode readers and camera phones. (Apps like Mobio and Kaywa allow phones to read the code) The information encoded can be text, URL or other data. What does this mean? Simply put, it means QR codes will allow the user to watch book trailers right on their smart camera phones.
How do they work?
How to create them?http://zxing.appspot.com/generator/
Some Middle School QR codes to booktrailers
Some Upper Grade QR codes to booktrailers
More titles & Codes
QR code, booktrailer,