Here's a tough one.
All my music has proper metadata, according to Last.fm standards. However, I name my artist directories in library order, so that all my "Elton John" music is in a directory "John, Elton". Last.fm doesn't like this. I would like some way for Subsonic to be able to support displaying library order, yet still keep Last.fm happy.
Ideally right now, I would be able to just drop a file called something like '.artist' into each directory with the artist name, but that's very Unix centric. How about 'artist.fm' ?
Other ideas welcomed.