I am often asked to share the lists that I use personally to implement GTD, with Lotus Notes and the Treo 650.
My lists are terribly exciting - they're certainly not original - but they work very well for me. The greatest challenge was coming up with a list that remained within the 15 category limitation of the Palm. Ultimately, that limitation proved to be a blessing as it forced me to further refine my lists.
For those who are curious about my lists, here's what I use:
I hope that this information is helpful.