Quite some time ago I read an article from Tammy Cravit on her implementation of GTD using Memoleaf. At the time I did not have a Palm anymore, so could not try it, but I remember thinking that the set-up was great.

I am afraid that googling her and the app shows up the link to the article, but the link is dead. If you manage to find it, it'd would be interesting to look at.