I have used Bluetooth headsets before when I was driving in a car. They are generally easy to use, but at one point or another I always have a brain fart and forget what button does what and end up turning on pairing mode or something when trying to answer the phone.
Jawbone has a new Bluetooth headset that you can control with motions called the ERA. The thing is very interesting and the headset has lots of features for cleaner audio and a speaker 25% larger than prior models to improve sound quality. The headset uses NoiseAssassin 3.0 technology to cut down on background sounds, and has an integrated accelerometer.
That accelerometer allows the user to take advantage of the MotionX platform on the headset to issue commands. For instance, you can shake the headset to enter pairing mode, or tap it to answer or end a phone call. That is pretty cool. I do wonder if you are wearing it to work out or something if it might accidentally sense impact from running as commands.
The ERA will ship on January 23 for $129 (USD).