My system is Palm TX with ShadowPlan for Palm OS (outliner)
ShadowPlan holds my project lists, next actions, Someday Maybes, Single Tasks, Recurring tasks and my agendas.
Datebook 6 for my Calendar (hard landscape).
Shadowplan syncs to the desktop.
Datebook syncs to OutLook and Pimlical (Datebook Desktop Calendar)
The whole system is called JoesWorld