I've copied my entire iTunes library to a 128GB USB stick which I use in the car. While I remain disappointed/dismayed there's no iPod integration with this techno car, I've found the USB drive works pretty well, only missing playlists and the ability to shuffle songs. Anyway, is there a way to keep the USB drive in "sync" with iTunes? What I'd like to be able to do is periodically take the USB drive from the car and plug it into my computer to have any new music I might have purchased be copied to USB drive. I know in Finder I can recopy the entire iTunes library to the USB drive and then select the "do not overwrite" dialog when it starts trying to copy an existing file from the Mac to the drive. However, I assume if I have a folder in iTunes called, for instance, "Elton John" which has a new subfolder with a new Album name "Diving Board", that new Folder/Album will not be copied without recopying all the other subfolders within the top-level folder? Hope that makes sense. I'm just trying to figure out when I purchase new music in iTunes if there'a an easier way to update the USB drive than merely remembering what the new music is and copying that individually.