Logitech doesn't own the market on wireless headphones for your iPod. Now there's the icombi AH10 wireless stereo headphones by AirLogic Co., Ltd. And in case you'd actually like to use them with something other than an iPod, they also work with computers, mobile phones and gasp other MP3 players as well as your home audio system. Comes with a Bluetooth 1.2 interface and different dongles for different sources. Should be able to play 11 hours of music on a fully charged battery and costs about $138.
icombi AH10 Wireless Stereo Headphones [Portable Gadgets]