I think GTD have change the way my brain works but the fallacy of using certain tools like how i use my iPod Touch is that entering alot of information is just not productive lol.
So i tend to only areas of focus/responsibilities as main projects
and anything else will be a sub project. I dun make them to deep hierarchy.
IMO if i have too much area of focus i'm really finding it difficult to close them.
So only 2 levels. then again hmm, why are we talking about projects when i thought we are on sub contexts =)