“Thoughts on” journals
Derek Sivers, “Benefits of a daily diary and topic journals”:
There are certain subjects in your life you think about a lot. People, places, hobbies, health, plans, finances.
For each subject that you might have ongoing thoughts about, start a separate “Thoughts On” journal. Whenever you have some thoughts on this subject, open up that file, write today’s date, then start writing.
To give you an example, here are my “Thoughts On” journals as of today: