SDL MAME Wii is an Arcade Emulator based on SDLMAME. Many games for early arcade boards can be played with varying amounts of success.

Changes:

Upgraded libfat to 1.0.6, hopefully this fixes the SD card corruption bug
Added USB support (Start SDL MAME Wii from a USB drive to enable it)
Fixed “Unexpected option gl_lib queried” error log
Fixed Nunchuck control mapping
Switched Buttons 1 and 2 around (by public demand)
Fixed support for some games (including Donkey Kong and Frogger)
Moved errors.txt and ui.bdf files into /mame/

Source & Support: http://www.tehskeen.com/forums/showthread.php?t=15094

http://wiibrew.org/wiki/SDL_MAME_Wii