A while ago now, I heard Dr. Saul Greenberg from the University of Calgary speak about his work on Proxemic Interactions. This work will have massive ramifications on the UI world. I'm excited to start thinking about how to integrate these ideas into VCD coursework (and the classroom!).
He shared a lot of interesting articles, most of which can be found on his lab's website (http://grouplab.cpsc.ucalgary.ca/Publications).