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.
Considering that you cannot re-sell a Kindle book and can only "lend" it to the (at most) handful of other Kindle users that share your account, Kindle sales a massive boon to Author's Guild members. There's no such thing as a used Kindle book store. There's no such thing as a public Kindle library. There's no distribution cost. Hell, there's not (currently) even a typesetting cost, as the Kindle doesn't handle the kind of fancy typesetting that makes some printings art in and of themselves.
The sheer amount of extra cash that publishers and Author's Guild members will get due to these issues dwarfs by probably an order of magnitude any lost "book plus audiobook" sales. The greed involved here is stupefying - I'm starting to think that there's something just completely frakked up about the thought processes of the creative class. Considering that the majority of them are probably cocktail party social democrats makes the hypocrisy even worse. Wear the Che Guevara t-shirt but if you even THINK about interfering with my ability to squeeze one more dime out of the 47th re-pressing of the 12th edition of my greatest hits, I'll sick my pack of lawyers on you.