http://www.yourrunning.com/blog-couch_potato_redefined - Bike Simulator

http://athletemovie.com/blog/2007/06/20_minutes_on_alpe_dhuez.html - The Expresso Bike Simluator - 20 MINUTES ON ALPE D'HUEZ

http://www.racermateinc.com/computrainer.asp - Indoor bike training simulator

Surely these concepts can be applied to other gym equipment, maybe using equipment such as the TRACK IR can also enhance the experience to make it more exciting, challenging and immersive...