Joshua Wright of www.willhackforsushi.com gives a demonstration of injecting audio into a blutooth headset device and eavesdropping on conversionby the victiom or people around him.

From Hackzine: “All that is necessary is knowing the device address, which can be easily sniffed, and the secret pin, which defaults to 0000. The headset audio is tapped while not in a call, so any room conversation the headset’s mic can pick up can potentially be listened to remotely.”

Something I definately look forward to try out sometime.