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Body area network (BAN), wireless body area network (WBAN) or body sensor network (BSN) are terms used to describe the application of wearable computing devices

Like fitbit. This is a wearable bit of kit that can track your daily habits. It can even remind you to be active or wake you up at the right part of your sleep cycle.  Complements an iphone app. Hopefully and android one will come along soon. Released in the US on november 6 2011. Not sure when it will reach the uk. 

Wearable sensors collect data from athletes as they're playing-data that could soon be broadcast during the game.