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Be able to display if a track and/or an album has already been added to a playlist and if it has which one.
Already a feature with a certain other music player.
This would be of great help when organizing a large number of playlists. This should not be to hard to implement either 🙂
I was going to post this same idea. So here's a +1 for this.
Not sure if they can replicate the functionality of that certain other music player, so they might have to get creative:)
Here's a related post:http://community.spotify.com/t5/Spotify-Ideas/Feature-request-Indicate-playlists-a-song-is-on-in-con...
(Looks like the other one was posted first)