In case you haven’t heard about the bone conduction technology, you should know that the main idea behind this is in transferring sound using human bones. To put in other words, such headphones doesn’t necessarily have to be in your ears — holding them in a proximity of ears should be good enough.
I admit I’m quite a sceptic for this kind of gizmos, though I would love to give them a try. Plus, the one on the image above are waterproof, meaning you could actually take them on pool — although I don’t understand how would they stay connected with a phone or a portable media player? (Bluetooth?) Anyway, Morito has presented the first (that I’m aware of) such headphones at Wireless Japan 2007, and will start selling them somewhere in August for $80.