The Palm PDA is a tool I still use daily for planning, organizing and writing. A properly configured Palm OS device is a great offline tool that allows you to maximize your productivity while keeping your private data off the Internet. Here follows a list of applications for Palm OS that I have resource edited to be useful for my day to day activities.
Agenda is a light-weight, yet functional replacement for Palm OS' somewhat limited Datebook. It contains an additional view, and add the ability to add tasks with a checkbox that move along with the day as long as they remain unfinished, all this while being fully compatible with the Palm OS Datebook database.