RBC bank in Canada is using this technology based on the concept of a unique heartbeat to facilitate payments [1]. It is basically a wrist band with NFC...but it sounds like it also monitors your heart beat to make sure you really are the one wearing it.
I'm a co-founder of Idenux and we are excited to show you our ECG (electrocardiogram - your heart signal) based biometric and healthcare technology.
Idenux ECG is a software and hardware devkit on which you can build security and healthcare applications. We are now taking sign-ups for the first batch of devkits and are looking forward to any comments, questions or ideas you might have.
A little sarcastic-psychological note: "ONLY 92 PLACES REMAINING." makes me think there were 100 to begin with, and only 8 people have been interested so far...
[1] http://www.cbc.ca/news/canada/toronto/royal-bank-to-test-out...