I've been running the same todo list system for almost twenty years now. It's basically David Allen's Getting Things Done, with the usual tweaks and adjustments

I've been running the same todo list system for almost twenty years now. It's basically David Allen's Getting Things Done, with the usual tweaks and adjustments that accumulate over time as you actually use it. Since I stopped using a Palm Pilot, my next stop was OmniFocus and that's where I still am. The biggest problems that I've seen people have with todo lists is 1) not getting in the habit of trusting them, and 2) not re-evaluating their commitments instead of treating everything on them as etched in stone as soon as it's recorded. I regularly look at my lists and go, "That? Yeah, that's not happening." I also have extensive "Now now" files (used to be Someday/Maybe), and at this point they've evolved into a half dozen different files for categories of not nows.