FCE Ultra GX is a modified port of FCE Ultra v0.98.12. With it you can play NES games on your Wii/GameCube. The GUI is powered by libwiigui.

Changes:

* DVD / USB 2.0 support via IOS 202. DVDx support has been dropped. It is highly recommended to install IOS 202 via the included installer
* Multi-language support (only French translation is fully complete)
* Thank you to everyone who submitted translations
* SMB improvements/bug fixes
* Minor video & input performance optimizations
* Synced with official FCEUX (various game fixes)
* ROMs larger than 3 MB now load
* Now also searches in application path for gg.rom and disksys.rom

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

Source: http://www.wiibrew.org/wiki/FCE_Ultra_GX

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