after a looong time I decided to jump back into the radionula codebase and try to make that background playback a reality. it took me just a day thanks to AudioStreamer created by Matt Galagher and forked by DigitalDJ.
but, it only works on newer devices. the old 2nd gen iPod I have can't handle it. well, it could, if I would jailbrake it and apply some hacks. but I am not that kind of person.
so go update or not!!!