For as long as I've been coding, I've been writing notes and sketching system diagrams in paper notebooks. But it wasn't until the last few years that I started systematically capturing day-to-day notes electronically. This simple technique can help you become a more effective programmer (and maybe even make the case for your next raise). Join me to learn about the tools to build your own programmer's notebook and how I use Emacs and org-mode for mine.