I picked up this elegant and tiny Bluetooth Headset today at the flea market (only $2) ... called the Jabra JX-10. On the adapter it is listed as BCE-JX10. It is great sounding, easy connecting adapter that has an awesome little dock to charge it.
Pairing is easy.
1) Turn the unit on by holding in the "phone button"
2) On the earpiece side of the headset, press in the small button in the center - this places the unit in Bluetooth Pairing mode
3) Enter "0000" as your pairing number on your phone (or Mac/PC)
I noticed that the process seems much quicker - pairing my iPhone with the new 2.0 firmware.