“My final advice about choosing and implementing a task management system is to be careful. No other productivity tool enables needless tinkering as effectively as a to-do app. I recommend you pick a task system as sophisticated as you need it to be, but not one bit more complex than that.”
That’s great advice, as someone who’s willing to spend money on task-management software is also likely the same person who’ll succumb to a desire to fiddle. I love OmniFocus, but I also love a simple list on paper.