A local ham showed me a pair of these today. Really nice, and they work well. While the headphones are designed for MP3 players you can find a stereo-to-mono adapter at Radial Shlock.
<http://www.180s.com/pages/catalog_view.aspx?g=1%2c2&y=7&i=8&c=1> Disclaimer: I have no connection to the company, not even as a customer (yet). Mike
