I'm not using them either, but initially had planned on using them for an audio-play I was working on, as a brainstorming tool, in form of a digital board, where I could "pin" notes in different groups and link them (with digital string :D).

Like, there could be a group of notes, each representing a place. Then there could be links to all the actors, that are in this place, to a given time, and so on.