If you use org-mode, this is what made my emacs experience reach a whole new level (I literally have every aspect of my life in .org files now - I can tell you what I ate for lunch 7 months ago, which isn't especially useful but really fun to point out).

You don't seem like an emacs newbie though, so you might have already seen the above. Recently I came across this setup, which has an inspiring organization and some very cool ideas which might be useful to you. This guy also wrote org-drill, an awesome SRS implementation for emacs - it even supports incremental reading!