I recently installed an XCarLink device into my Honda, and so far it's been great. Before buying it I did my homework to understand how MP3 files are organised in the six "CD" folders, and decided to put together a quick Windows desktop app to try and make managing it easier. I've done something like this before with the Audi RNS-E sat nav unit, which uses SD cards, and this proved popular so I thought I'd have another go - this is aimed at Symphony or Chorus users who have the device installed.
All you need to run it is Windows (XP, Vista or Windows 7). Once installed, you set your default Music folder and target drive (the drive letter most commonly associated when you plug an SD card or USB stick into your computer) and then simply drag/drop music into each of the six CD columns. You can save your playlists so it's possible to create several different versions with different music, and then with one click transfer it to SD or USB. There's also a function to save your playlist as an M3U file for use with other media players.
Just to add that it's completely free of charge, and that it is in no way endorsed by XCarLink or its suppliers. Download from SourceForge here:
If you use it, please provide feedback in this thread. I'll do my best to add as many features as I can, as well as fix any bugs