These were then placed in the hallway outside the media center. The students were then able to use the ipod touches that we had in the Media Center to scan the QR code to listen to the book talk and get students interested in those books. The Scanning App I have used is called Scan - from QR Code City.
If you have trouble using Vocaroo, there are several options for QR Code Generators. It does get a bit tricky to record your own voice as some will change text to voice only. Here is a link I found describing some options
http://educationqrcodes.wikispaces.com/Qr+to+Voice.
For the past two Easters, we have created QR Code Easter Basket Hunts for our three boys.
Scan the QR Codes to reveal a clue to where the next QR Code is hidden, and so on until they find their Easter basket.
I absolutely love integrating these technology tools and am always looking for new ways to implement them. (And kids love them!)