This paper (10 page PDF) considers several aspected of augmented reality (AR) design: the sort of detection needed (which, in this case, does not use depth, but merely focuses on fingertips), and the sort interaction that should be supported (based on interviews with children). This is framed in the context of work with a motion controller called Leap Motion, "which can specifically recognize fingers and interact with gestures." The paper's results should be considered prelimiary only, but it does offer a good example of where the domains of AR and human computer interaction (HCI) come together.
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