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:

[3.1.2 – December 2, 2009]

* Fixed SMB (for real this time!)

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/