Tantric has released a new version of his emulator for the Wii:

Snes9x GX is a Super Nintendo™ / Super Famicom emulator for the Nintendo Wii.
Snes9x GX is a port of Snes9x (http://www.snes9x.com).

Snes9x GX is a "homebrew application" which means you will need a way to run
unsigned code on your Nintendo Wii. The best website for getting started with
Wii homebrew is WiiBrew (www.wiibrew.org).

* Based on Snes9x 1.52
* Wiimote, Nunchuk, Classic, and Gamecube controller support
* SNES Superscope, Mouse, Justifier support
* Cheat support
* Auto Load/Save Game Snapshots and SRAM
* Custom controller configurations
* SD, USB, DVD, SMB, Zip, and 7z support
* Autodetect PAL/NTSC, 16:9 widescreen support
* Original/filtered/unfiltered video modes
* Turbo Mode - up to 2x the normal speed
* Zoom option to zoom in/out
* Open Source!

[4.1.6 - March 30, 2010]

* New core! Updated to Snes9x 1.52. Old save states will not work!
* 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
* Now uses .srm files without "Auto" appended, if found
* Added option to disable crosshair

http://code.google.com/p/snes9x-gx/downloads/list