I was fortunate to visit the offices of Attivio this week for a reception party where they announced the launch of their search platform. They had many interesting applications of the underlying technology to demonstrate their capabilities which you can explore in their web site (which my company built!)
The boy in me was most fascinated by the RFID located in my name tag. While they singed us into the party they asked some simple questions. In my case, where I had lived, went to school and worked in the past. As I wondered around the office space the RFID in my name tag was tracked by receivers strategically placed near large, flat monitors mounted on the wall. If I wandered within 10-15' of a monitor it would register my presence and the presence of those around me. Using their underlying database technology it generated tag clouds weighting items I had in common with the people around me more heavily.