But, are these subject to the same "line of sight" requirements as my Treo phone and Treo bluetooth headset? With the phone in my left pocket and headset on my right ear, there's slight crackling. For music, that would be terrible.

Or does my headset/phone just stink? Or can the Treo send MP3s to fancy bluetooth headphones....... hm.....
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FireFox31
110gig MKIIa (30+80), Eutronix lights, 32 meg stacked RAM, Filener orange gel lens, Greenlights Lit Buttons green set