Well, I’d personally just call it a headset or stereo headset like they have for computers, but apparently phone headsets are mono.
A friend was wondering if he could somehow make a modified version of the Logitech Bluetooth Headphone for MP3, which basically allows one to turn a headphone jack into an A2DP jack. If he could use the 3 ring (microphone added) version, and add a mic to the headset, the lack of A2DP wouldn’t matter. (Apparently nokia uses the same prongs?)
But nobody’s done it yet. WTF. Technically the bluetooth headphone for mp3 could be plugged into the Shure iPhone Headset Adapter, but it only gets the job halfway done unless it’s some really great mic.