This demo -- from Pattie Maes' lab at MIT, spearheaded by Pranav Mistry -- was the buzz of TED. It's a wearable device with a projector that paves the way for profound interaction with our environment. Imagine "Minority Report" and then some.

Especially towards the end, where they nshow possible applications, it becomes really interesting from the perspective of the field of real time economy.  

Link: http://www.ted.com/talks/pattie_maes_demos_the_sixth_sense.h tml