NOTE: This is NOT MINE. It was made by developers Yoyofr and Metaview, with additional work by the developer Tinnus.
I am posting this because a lot more Palm OS users need to know how awesome this app is.

Emulator Name: Little John Palm OS (LJP)
Platform: Palm OS
Emulates:
NES, SNES, GB, GBC, Sega Master System, Game Gear, Genesis, Atari ST/2600, Neo Geo Pocket, Wonderswan.
Freeware or Shareware?: FREEWARE
Where To Find This Emulator:
http://www.little-john.net

Direct Download Link:
http://little-john.net/files/LJP-1.0rc8.zip

Description: Little John is a FREEWARE emulator for Palm OS 5 and up. It's a Palm OS NES Emulator, SNES Emulator, Gameboy Emulator, Gameboy Color Emulator, Sega Genesis, Master System, and Game Gear emulator. This thing is truly a work of art and is a MUST DOWNLOAD for any Palm OS owners. Check the official website if you have any issues. Don't forget; there might be other Emulators for the Palm out there, but this one is FREE.
Features Include: Mappable Buttons, Video Smoothing, Frameskip, 3 Save State slots + 1 quicksave state slot, SRAM support, Turbo Speed and more(?).