Personal Knowbase, a program that I always think of when I think of Daniel Luedecke's Zettelkasten, has an interesting way of reporting on its keywords.
Now, it would be nice, if my favorite application had something like that (sans keywords, of course). It's another way of revealing clusters in one's notes.
1. For the Zettelkasten, see last post. I have also written about personal Knowbase before.