I am an avid user of Natara's Bonsai Outliner and have come up with what I believe to be a killer GTD Implementation. If you use the Palm for GTD and have not found a good List manager this just may be the one for you. Check out my blog at www.palmorganized.com for the implementation instructions.
I welcome your feedback there or here.
Enjoy. Happy Chinese New Year & may your mind be like water.