disclosure: I am the Director of Edcuational Technology at Mulgrave. This fall Mulgrave School in Vancouver, Canada, handed iPads to all the Grade 3 classes. Three weeks into the academic program and lead teachers on the project, Melanie Cannon and Shauna Ullman throw down one of the best uses of the iPad I've seen yet.
Lately, we have been discussing using QR Codes to help manage workflow for disseminating content to be accessed on iPads. This is another great post from Richard Byrne, with an embedded Common Craft video, explaining ideas for QR Codes in the classroom.