FCE Ultra GX is a modified port of FCE Ultra. With it you can play NES games on your Wii/GameCube. The GUI is powered by libwiigui.

Features:

Wiimote, Nunchuk, Classic, and Gamecube controller support
iNES, FDS, VS, UNIF, and NSF ROM support
1-4 Player support
Zapper support
RAM / State saving support
Custom controller configurations
SD, USB, DVD, SMB, Zip, and 7z support
Cheat support (.CHT files)
IPS/UPS/PPF automatic patching support
NES Compatibility Based on FCEUX 2.1.3
Getting Started

Changes:

[3.1.9 – July 14, 2010]

* Fixed 16:9 correction in Original mode
* Fixed PAL/NTSC timing switching issue
* Ability to use both USB ports (requires updated IOS 202 – WARNING: older versions of IOS 202 are NO LONGER supported)
* Hide non-ROM files
* Other minor improvements

Free and legal NES roms to try with this emulator can be downloaded from here: http://www.pdroms.de/files/nes/

http://code.google.com/p/fceugc/