Classic city-building computer game SimCity was also released for EPOC32 operating system. I recently opened a new box and tried to run it the game a Psion 5MX. 20+ year old floppy was successfully read by Libretto 70CT floppy drive. The game runs flawlessly. And the save files are compatible with the DOS version of the game.
Computer History Museum in Mountainview, CA is the largetst computer museum in the world. It contains very interesting exhibition of mobile computers, including handhelds.
Here is a small gallery of extraordinary items, like PalmPilot prototypes.
Lots of other remarkable photos from this museum, which are not related to handheld computers are presented in the Computer History Museum gallery.
I met the owner of this device few days ago. The guy told me that he repaired this device by himself, and now uses it for programming microcontrollers. He writes programs in C and Pascal. The main advantages he mentioned were small size and extremely long battery life.