A video has been posted by the creators of the interactive musical installation in the washrooms. Check out the video and grab the open source Roomware server if you want to do something like this yourself.
Following are a bunch of links from the Dutch blog, Dutch Cowboys. They did a series of interviews at the event.
Interview with Dave Girolami from FITC
Interview with agency Adobe booth: Achtung!
Interview with agency Adobe booth: Euro RSCG
Interview with agency Adobe booth: Qi
Interview with agency Adobe booth: Lost Boys