Let the hive mind of Engadget get that for you.
"For a long time I have been searching for a portable device where I can store all of my CDs in MP3 format and stream the songs wirelessly to my HiFi system. The portable device must I've tried FM transmitters, they all suck. I don't want a docking station. Any help? Thanks!" have a display so that I easily can scroll through the playlists (I don't want to use a TV or monitor). I suppose that there must also be a second device that is connected to the HiFi system that would receive the wireless streams from the portable device.
http://www.guardian.co.uk/media/2009/mar/11/product-placement-ban-continues
I assume that since Nintendo is actually paying for the show, there'll be some greater level of advertising than just slots at the beginning and end of each break, which they do quite often anyway.