If you happen to use a Bluetooth headset with your iPhone, then you may want to check out the MoGo Talk for iPhone.
The MoGo Talk is basically a combination of a case that fits over your iPhone, and a Bluetooth headset, the headset can be stored and charged in the back of the case.
MoGo Talk™ for iPhone is the first Bluetooth headset that can charge with your mobile phone and is capable of delivering superior audio quality in an ultra-thin (5mm) design. Mogo Talk’s ear piece is specifically designed to comfortably fit inside your ear, not around a clunky speaker like other Bluetooth headsets.
When you charge your iPhone, it will also re-charge you Bluetooth headset at the same time, if you want one the MoGo Talk for iPhone is available for $129.99 .