right,the blue tooth dongle was about £10 from a computer shop near me,it just plugs in to the USB port,then i right click on the file and send to "bluetooth device" (after installing the drivers and software of coarse.

If you want a bit of software that will convert from xxx to mp3 try a google seach for "audacity" also you will need to install the "lame codec" as well.Google seach yet again.

I also have a bit of software that will convert any mpeg to any thing so that you can watch all types of video on the d600 if you want it though you will need to pm me on that one