If you're looking for the eventual evolution of the headset look no further than the On Time Headset from Pedro Gomes. This headset comes with a matching bracelet with which it can both dock and work simultaneously.
The bracelet functions as a sort of caller ID when the headset is in your ear. You could either accept or reject calls by pressing on the bracelet's touchscreen panel. I'm not really huge on headsets, but I would gladly change my tune if I got my hands on the On Time Headset.
Caller ID Bracelets
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