playlists is normally never used in a full screen jukebox application, because they works very defficent than Itunes, which is just a media player like Windows Media Player.
I have not I tunes my self, and MultiJuke example dosent use playlists at all by now.
So I guess, no software I known use playlists, and if they do, it typically use *.m3u files. MultiJuke does not supprt playlists yet, but might support in a future version, using a playlist library.
I do not known Itunes playlists is difficent, but have no planing to support them.