Can't help on the trackball, but I recently got a Trekz Titanium bone-
conduction headset, and I really like it.  Takes a little getting used 
to, but they work really well - and actually very nicely on an airplane 
with earplugs (better than my noise reduction Bose headphones, in fact).

They're bluetooth.  Using them right now to listen to Spotify on my Linux 
box - also use them with my Mac, Android devices, and even my new Yamaha 
receiver.

The thing that takes getting used to is that they don't cover your ears, 
but instead contact the bone right in front of your ears.  Last night, 
using them with my receiver, I switched from playing my PS4 to the cable 
box, and it seemed loud, so I tried to turn the volume down, only to 
realize that I wasn't hearing the music through my speakers, but through 
the headset instead (and the volume control in the receiver doesn't 
control the headset volume).  That still catches me by surprise.

Jim
-- 
"I learned long ago, never to wrestle with a pig. You get dirty, and 
besides, the pig likes it." - George Bernard Shaw

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