LJP, the Ultimate Palm Emu

(I use it all the time, just thought I'd mention it -- it's far better than any other palm emulator... and its free!)

http://tinnus.gp32z.com/ljp/

Little John PalmOS (or LJP in short) is an open source multi-system emulator for PalmOS 5.0 (or newer) devices. Currently it emulates the following systems:

- Nintendo Entertainment System (NES)
- Super Nintendo Entertainment System (SNES)
- Nintendo Gameboy/Gameboy Color (GB/GBC)
- Sega Genesis/Megadrive
- Sega Master System (SMS)
- Sega Game Gear (GG)
- Bandai Wonderswan/Wonderswan Color (WS)
- NeoGeo Pocket/NeoGeo Pocket Color (NGP)
- Atari 2600 (VCS)


Features:
- Sound (except WS)
- Multiple screen modes (zoom/smoothing)
- Adjustable/auto frameskipping
- SRAM support
- Multiple Save/Load state
- Turbo mode
- Support for zipped roms