The *only* PDA that is good for gaming is the Zodiac: http://www.tapwave.com
You can get the Zodiac 1 from eBay for around $100. Now with Doom, Quake, Hexen, MAME, NES, GB(C), GBA, SNES, Sega Master System, Genesis, Gamegear, Wonderswan (Color), NeoGeo Pocket (Color), C64, TG16, ScummVM...