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:

3.1.6 – April 9, 2010
* Fix auto-save bug

3.1.5 – April 9, 2010
* Most 3rd party controllers should work now (you’re welcome!)
* Translation updates (German and Dutch)
* Other minor changes

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/