A bit of an older talk, but still quite interesting:

Isobel Demangeat, UX researcher at Qualcomm Corporate R&D Cambridge (UK), spoke at MEX in December 2011 on the nuances of short-range mobile interactions through augmented reality. Her in-depth talk shares the results of ongoing studies at Qualcomm’s labs in Cambridge, UK, bringing a much needed user-centred design perspective to the hype around AR.