I used to play a game called Space Trader on my Tungsten E, that I absolutely loved.
It was one of those mostly text (with some single-image graphics) adventure games where you travel around a virtual universe, buying resources on various planets and selling them to others to build wealth, which you use to buy bigger ships and weapons, etc.
You could fight thieves you'd encounter while traveling around, or go rogue and become a vigilante who would fight the police instead of the thieves (basically becoming a bad guy). So it was one of those games you could play to completion multiple times, but take different paths each time. It was incredibly well done, and I spent countless hours on it.
The game involved a lot of tapping on the screen. The only problem was you had to tap in the same places repeatedly, which led to me literally wearing a hole in the upper right corner of my screen, and the digitizer eventually stopped working.
The whole PalmOS was amazing. To this day it had a better calendar than any iPhone. The graphics and overall UI were much nicer to look at. All it was missing was the phone.
I miss the days when we had choice when it came to technology, and companies were actually competing to make better products, not just capture our attention.