The UBHS-NC1 by Lubix can be worn around the neck as a pendant or inserted into the ears as a standard headset. It's got 6 hours of talk time, 5 hours of music and 80 hours of standby. Unfortunately it doesn't look like it "works" in pendant mode, meaning, you can't use it as a speakerphone and talk into it. That would have gotten it four thumbs and big toes up in our book.

Accessory Bluetooth headset 'LUBIX' [AVING via New Launches]