Motorola's Motorokr S9 stereo Bluetooth headphones ($130) offer an extremely low profile and are very lightweight--about an ounce--with great sound for the size. The controls on either side are touch sensitive, so you don't have to bludgeon your eardrums while pushing buttons to change the volume. Making calls works well, too, though sound comes through on only one ear, which can be disconcerting when you've been listening to music in stereo.
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