In case anybody is traveling to the big city, this one might be worth a look:
MoMA EXHIBITION INVESTIGATES THE COMMUNICATION BETWEEN PEOPLE AND OBJECTS THROUGH DESIGN
Installation Provides Visitors with Greater Access to Information by Incorporating the Use of Technology, Including QR Codes and Twitter Hashtags for Each Object
Talk to Me: Design and the Communication between People and Objects
July 24–November 7, 2011
Special Exhibitions Gallery, third floor
Their website has videos of all the demos online. As I the question on “what makes a good demo video?” is still open, maybe there is some inspiration there.