Personally, I'm interested to know about *stereo* headsets. The new BT update in OS X now supports sound output to headsets but I don't want no steenkin' mono. Hell, I'd take a stereo headset with a PP9 hooked up as long as it was stereo. Hmm.. Haven't checked the specs but what's the max bandwidth on BT? I think I read that connections can be aggregated but then it would have to be a pretty whizz-bang headset to do that. Lots of surmising without looking things up.