I used to hand write notes, or use emacs org-mode. I now believe that my notes are in many cases substituting for poor procedures or documentation. As such I've given up entirely keeping my own notes and instead I fix the procedures or documentation.

I mean, fundamentally notes are things that are sufficiently important to know that you write them down for future reference. If you need it written down, then others probably do too, in which case the fact that it's in my notebook is useless to them. Therefore I even put my "personal" notes into my own page on the wiki so at least they're searchable. Usually they stay there until I find or create a better place to incorporate it into the rest of the docs.