Just as Jacques above. Mine started out as a replacement for all the white-out in my address book. Back then it was a Sharp and started at 16k That lasted less than a week before I exceeded 16k and had to upgrade to a 32k, but fortunately Office Max was tickled to let me trade up to the larger one for the difference in price. The rest is continual upgrading about every year or so. I kept outgrowing the memory and eventually switched to Palm. Now I am using the TX. Frankly, I use my Palm for almost everything I would use a laptop or PC for. I am an investigator for the Medical Examiners office. Daily, I look up drugs (ePocrates), medical abbreviations, telephone area codes, Lab. Reference Values, I have a Stedman's Medical Dictionary, the origin state for Social Security Numbers, and conversion calculator. And that is just at work. I have countless names in my address book and was smart enough to use the various custom fields to be able to sort for many purposes. I use Address+ instead of the standard Palm address book. I have Documents to Go so I have MS Word capability, XCell spread sheets (which I have designed for Personal Medical Expense, and Mileage for Income Taxes, Statistics for work (monthly comparison and graphing), and even Acrobat Reader capability. One that is use often is a simple program that will look up the weather for your own specifiable locations every time you hotsync. One to adjust the Palm time to the Atomic Clock time every hotsync, and yes I have games. Every day I have access to 8 copies of the Bible, a prayer journal, etc. I use TapSmart-KeyLink very often for fully synchronized interchangeable data entry on the Palm and PC simultaneously. And Happy Days, a free program that helps me keep track of birthdays, anniversaries, license expirations, car inspection, home filter changes (air, water, etc), vaccination dates for my dogs, etc, etc, etc. I use the free TrackerDog to keep track of the latest update releases of Palm programs, which updates every hotsync. Of course, I use FileZ (freeware), and multiple Palm Diagnostic utilities (speed, IR, sound, alarms, analyzer, fonts,skins, icon edit and change, etc. etc. etc. I even have an old program (no longer available) to keep track of net accumulations of vacation, holiday, and sick leave for work minus what I use, all by categories. Ad Infinitum. There is so much more, but I am tired of typing. Fortunately the boss is not here on Sunday, so this is being done between work.
Suffice it to say, the Palm is not just a brain supplement, it is my brain. That is the official name given it by my wife when she teased me about it initially. That was three Palms ago for her, and she is Veterinarian. I would be lost without my "brain". Simply put, it is limited only by your own imagination and creativity, as well as by the programs (free and otherwise) that are available. No I do not work for Palm or even have any investment in it.