I've been doing GTD for a few years now, but have recently begun using Pocket Informant as my main tool for storing my GTD lists. It's a great tool, as many others on these forums have mentioned, that is feature-rich, flexible, very user-friendly, and works really well with Outlook. I'd highly recommened it, although I'm still learning how tweak it to work best for GTD.
One PI function that seems very appropriate to GTD is hierarchical tasks. However, this function doesn't seem to have been mentioned on this forum on any of the past threads on PI. It could be because it is a relatively new function.
So, I'm wondering, have any of the PI users out there found hierarchical tasks useful for GTD? If so, how have you implemented it?
I have a few ideas, but would like to hear what more experienced PI-users do first.