I never replied to this thread before because I haven't used my Palm for a while, I borrowed it to my girlfriend and she's on the US now. Anyway, that I can remember the game I played the most on my palm was Blocks (a tetris clone), that game is a classic, unbeatable, really...
Dopewars was good, but it only lasted for a few days, then I got bored. Same thing goes for most games I downloaded... Chess was good too. When I get my Palm back I will comment on other titles.