The only thing with using the SD cards on the RNS-E is that you loose your playlists from (if you're like me) you have spent years assembling. I tried the dension Ipod connector but it's not for me (hissing and problems with BT).

I found this link on the web, others may have found it already. It gives you a script that when you run using apple script editor copies all the songs from a Itunes playlist to your SD card and creates a playlist. It converts all songs to MP3 and creates sub folders to arrange the music on the SD card.

http://www.dexterparadise.com/Projec..._Audi_MMI.html

Very useful! Saves manually copying files and creating and deleting MP3 versions of M4a files.

I've only got it to work in part so far. I can copy all the songs to the card but can't seem to locate the playlist file when browsing on the RNS-E.

Give it a go if you haven't tried already!