Some other links you may like to check out:-)
Augmented Reality in Education - Nathan Jones - The iPad Comes Alive with Augmented Reality
Augmented Reality at Appelby School
QR Codes and Art - Langwitches Blog
QR Codes in Education - Virtual Learning Network Group and Resources
iPad/iPod User Group - Virtual Learning Network Discussion and Resources
My Story - Step by step how to....
Exploring Apps Blog - Tania Coutts and Tara Fagan - CORE Education