A seperate Timeline-Tool would be very interesting, which logs and shows all the notes you are working on, like a stream. It helps finding notes, eg notes used in a row turn out to be more important. In the other hand, it allows you to analyze your workflow and your stream of notes.
A Timeline introduces another layer of interacting and looking at your notes definitely!
What do you think?
here is a similar approach: Trails in the graph-view!