I got a shiny new Palm Pilot Zire for Christmas and while it was intended to get me more orginized (fat chance) I know the true purpose of this device. It is a descreet game system that I can use during class. I turn to the dopers to supply me with excellent (free) games. So dopers post your favorite (free) Palm games.
FreeJongg is an excellent and free version of the Chinese-mahjongg-solitare-game-popularly-known-as-Shanghai.
Prison is a fun and free Arkanoid-style arcade game.
CliFrotz is a free Z-Machine interpreter that will let you play all those classic Infocom text adventures on your Palm.
And while it’s not free, I find Bejeweled to be too damn addictive for its own good.
Beware. My dad has played so much solitare on his Palm Pilot that there are lines worn in the screen from his dragging cards with the stylus. He ended up putting clear scotch tape over the worst part.
Palm Pilot Zire? Pfft! I got a Nintendo 64 Gamecube, Microsoft DOS XP, and an Apple II+ iMac G5!
I’m a solitaire addict. Klondike, Freecell, Four Corners, and others. Lots of free ones out there.
Bejeweled and Bookworm. Not free, but worth every cent. I’ve spent more time playing Bejeweled than I have games that I paid >$50 for. Support shareware!
Bejeweled is worth every penny
I also play Spider solitare that is not free, and do not regret the price either.
others that can be played for free for a time, text twist, p-jong, and bounce out.
here is my favorite download site
http://www.freewarepalm.com/ 
I also second the recommendation to look at Freewarepalm.com. Great stuff can be found there.
The free games that I have on my Tungsten T3 are:
Patience 3.0.1 - Simply one of the best solitare collections ever for Palm OS systems.
Mulg II q - Move your marble around different mazes. Each maze is a puzzle to solve.
Pilot Mines - Implementation of Minesweeper for the Palm.
Cave Run - Avoide the rocks. Really addictive.
Yahdice - A really good yahtzee clone.
Games I’ve paid for:
Bejeweled and Bejeweled 2 - Can be downloaded from http://www.astraware.com, both are excellent games and incredibly addictive.
Euchre - From http://www.seahorsesoft.com - A great euchre game for the palm.
I hope this gives you a place to start looking around.
So how many of you play games, with the sound off, sitting on the toilet at work? 