+1 What I want, and will probably never get round to implementing, is Markov chain playlist generation. Collect play order from (high-quality, human-generated)

+1 What I want, and will probably never get round to implementing, is Markov chain playlist generation. Collect play order from (high-quality, human-generated) playlists, then use them to build Markov chains of tracks that tend to be played after one another.