• LiteFoot – A floor space for recording dance and controlling media
  Paper submitted to ICMC98
•  LiteFoot – Auditory Display of Footwork (ICAD98)
• LiteFoot: A Smart Dance Floor or a New Musical Instrument ("Elements 1/1999", UL)

One recent development demonstrated at the ACM Conference CHI 97 in Atlanta was MIT's Media Lab (Paradiso et.al. 1997): the Magic Carpet  

The Magic Carpet have for instance been used in the Brain Opera.  

Joe Paradiso's IEEE article "New Ways to Play: Electronic Music Interfaces"

Another interesting system is Todd Winkler's experiments with the Very Nervous System.

References 

Paradiso, J., Abler, C., Hsiao, K., Reynolds, M. (1997) The Magic Carpet: Physical Sensing for Immersive Environments. Proceedings of CHI'97, Atlanta, 22-27 March 1997. ACM, pp. 277-278.