Thanks, Mal. So do your write during the day as events occur, or just at the end of the day in summary? And then how do you use/organize those notes in the future?
Journaling appears to be the "hip thing" these days (google for more on this topic). I was skeptical at first, but have found the practice of keeping daily personal and professional journals invaluable. My personal style is to create single line categories (follow-up, look-at, personal, idea, etc) and add bullets underneath. I use strikeout formatting to mark items as complete. And red ink, yellow highlighting and bold/italic to make certain notes pop out when I'm reviewing in the future.
I use my journals as both todo lists and as diaries. Whenever possible, I update them throughout the day. I try to start my next day's journals at the end of each day although I'm not adamant about this practice.
I find my professional journal to be a great aid for completing customer timesheets. It's easy to forget all the things you may be doing on behalf of a project or client.
There are many products you can use for journals. I like Evernote because it's easy to use, available on all my devices, and captures and images, files and hyperlinks vs. just text.
Malcolm