Was browsing around and ran into these.
It reminds me of the old Bonephone from a decade or two ago that used simply a rectangular pad to transmit the sound to directly vibrate your inner earbone. Nobody could hear a thing except you.
The last Bonephone I saw on ebay fetched a very surprisingly large sum.
So as far as I can tell , nobody will hear a thing except you, in there is NO external noise at all, and at the same time I would imagine you can hear all around you also. That would be a strange experience, or maybe not 
Seems like these are also waterproof
I assume there are also currently some bluetooth jobs using similar tech now. I wouldn't know I don't BT or use Phones much.
Anyhow check them out.
http://www.aftershokz.com/AfterShokz-Sportz-M2-Open-Ear-Headphones-p/as321.htm
I tried cutting and pasting the tech specs but it got goofy, so hit the tiny tab and see for yourself.
Checked a few reviews and one that stood out was there was a person that had trouble hearing due to an accident, and these look like they bypassed that for them. Interesting anyhow.
I'm sure these have their place and time.
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Edited by nick n - 12/27/12 at 10:20pm
