It seems that there is an awful lot of interest in window display, sensitive floor, touchscreen interactive systems on the high street (see many of the recent posts) at the moment. We have just been pointed at this SensitiveWindow installation by our researcher in Rome.
Some of the screens in the Windows look hard to read (reflection, sunlight etc.) but that might be unfair because of the camera and pictures themselves.
If you browse through the Natural Interaction site you will also see some interesting interactive furniture uses (those Italians eh!)