I've found that actual paper works best for me -- I tend to jump around a lot, use special symbols, occasionally draw diagram fragments. Then when I'm done dump

I've found that actual paper works best for me -- I tend to jump around a lot, use special symbols, occasionally draw diagram fragments. Then when I'm done dumping core it gets transferred into emacs/org-mode, where it may get an editing pass to make it more coherent to future-me.