Quick note about drop sync - it 2-way syncs tracks to and from the dropbox cloud with no fuss.
I could therefore 2 way sync my whole Spotify 'database' of playlists and tracks.
What I'm interested in is being able to easily delete a track in the playlist if I don't like it any more. I want this change to centrally update, so the playlist stays updated on the main spotify server.
This way the playlists will stay fresh.
Now I think about it, probably the Dropsync idea wouldn't work - what's the best way of doing this?