I recently checked out this Bluetooth earpiece at the Apple store, it's a nice accompaniment to the iPhone. The Metal from Contour Design has an aluminum casing and weighs just 0.2 oz. It has five hours of talktime or seven days of standby. If it does get drained you can plug it into any USB port, even the included car adapter, for a quick re-charge. It has Bluetooth features including managing calls to volume control. The Contour Metal comes complete with protective holster for both the USB charger and the headset itself and sells for $79.95.