Okay, so mine is a pink silicone number I scored at a blog conference, but having a passive (acoustic? no-batteries-needed?) has totally made my music listening easier, and greener, and I can't recommend it enough.
Found at Poketo.com -Traditional craft meets retro modern design. This wooden radio and MP3 player, designed by Singgih Kartono, is hand-crafted in a farming village in Indonesia from new-growth wood. For each tree that is used in the production of the radios, a new tree is planted.