I thought the Squeezebox or Logitech UE had bluetooth, but I don't think they do.
Try this
link, Larry.
There are all kinds of wireless internet radios with bluetooth, but they seem to be for pairing with a phone to play content, like Jay said. I didn't look very far, though.
I do exactly what Michael mentioned. Bluetooth laptop, Motorola Rokr bluetooth headphones out in the shop.
You could do what you want with an ipad, smartphone, old iphone, ipod touch, whatever.
If my laptop didn't already have bluetooth, I'd buy a bluetooth usb dongle and a pair of headphones at Amazon. Probably around 50 bucks.