While it's true that OmniFocus grew out of a GTD tool, it's our goal to build a tool that helps folks be more productive regardless of their preferred organizational system.
I'd like to use this thread as a starting point to collect useful resources for folks using those systems. My hope is to eventually un-sticky this thread and replace it with a F.A.Q.-style sticky with a collection of useful links organized by productivity system.
Doing some forum and google searches, I came up with a couple of resources. Help in finding the legions of others I've probably missed would be greatly appreciated. :-)
Franklin-Covey (Seven Habits)
Pomodoro Technique
Auto-Focus
Like I said - I'm sure there are other systems I'm missing here. Point them out and I'm happy to add them.