Daniel Michelis recently completed his Ph.D. dissertation on a topic that is dear to my heart. Information about his research can be found on his Interactive Displays in Public Spaces blog.
(Note: This was cross posted on the Technology-Supported Human World Interaction blog.)
Here are links to a few of his posts:
Interactive Displays: Perception, Awareness, and Interaction
Evaluating Interaction with Display Applications in Public SpaceI especially like the diagrams Daniel uses to depict zones of interaction:Figure 3: Four-phase Model
(Source: Daniel Michelis (2009), according to: Vogel and Balakrishnan, 2004)
(Author: Daniel Michelis, Institute for Media and Communications Management, University of St. Gallen)


Figure 1: Perception and Usage of Interactive Displays
(Source: Daniel Michelis (2009), according to: Brignull & Rogers, 2003)