My lovely wife just bought me a set of Bluebird Bluetooth headphones (Freedom Sprint model).  They are great headphones.  The range with my iphone 4 is over 15 feet.  The sound is awesome and you can control everything from the right earphone.The best part to me is not having to worry about the cord tangling and getting caught up on everything and getting yanked out of my ears.  They stay charged for several hours and use a usb type charger.If anyone is considering the switch to wireless you need to check these out.AJ