if i remember correctly, palmOS is database-driven, and not based on files like most other operating systems. that's why it hat it's problems when it came to multimedia etc.
it was also never capable of true multitasking.
but it's amazing to see what kind of programs y'all got on your phones. neat
my system is pretty boring, then. i actually only have mobipocket installed on my symbian UIQ3 phone.
i used to have a calendar-replacement, a file manager as well as a task-switcher on my p900 (UIQ2), but the p1i (UIQ3) has added those to the system, that's why i only need an ebook reader. might install me a few games, though ...