Shortly after my wife and I finished Getting Things Done we accomplished the first step - Collecting. We gathered every loose piece of paper in our world into one pile. We wrote down intangible incompletes ("organize closet") and added them to the pile. I added boxes of "to do" and "to be filed" items from one and two house moves ago. It was quite a pile.
Anyway, yesterday she gave me the gift of five uninterrupted child-free hours to process through my vast pile. And I made an enormous emount of progress. I now have a list of doable next actions, some deferred actions for specific times in the future, some someday/maybe items that I won't stress about not doing, and the beginnings of a useful file system for items I will need in the future.
I think this whole thing might work.