I finally got around to reading Getting Things Done by David Allen (Thanks CGPGrey) and while I'm only about half way in, I understand that the basic is to have a system you can trust and dump all your thoughts into said system and then apply its methodology.<p>But I also understand that it can't be the only method out there or how GTD method might not work for everyone.<p>So I'm curious to know, what is your productivity workflow like? Do you keep ideas in a separate app? A multiple of apps? How often do you (if ever) review?