Mp3Drop
Sort and copy mp3 files to USB stick
...For this purpose the stick needs a flat folder structure and be sorted alphabetically before copying.
The small Qt4 dialog has a drop area where you can drag mp3s (from file manager or Amarok, perhaps also other programs) onto it and it will read the ID3 tags and create a sorted folder structure with "Artist - Album" and shows the number of tracks and size it would take. When you are ready filling the collection press OK to copy it.
At the moment there aren't many options but I could put some more effort into it, when someone is intereste.