I keep a daily work + personal note journal in Emacs using org-journal. All the files are synchronized using Dropbox between my machines. The journal is a mix

I keep a daily work + personal note journal in Emacs using org-journal. All the files are synchronized using Dropbox between my machines. The journal is a mix of a TODO list and a diary. I also have a tagging system for all the entries which allows convenient searches/stat building. Benefits: 1. Allows to do primitive daily planning. 2. Having my daily plans/notes in searchable format allows to do all kinds of mass retrospectives (I know what movies I saw, music I enjoyed, things I did for both personal/job-related projects). 3. Being able to go back to a certain date and see what was done sometimes even helps to sort out various job-related issues.