So I just came across this and thought it was pretty cool. Thought I'd share.

http://wiibrew.org/wiki/Visual_Boy_Advance_GX

Download from the link I gave you above. Then you can follow the tutorial if you don't already know how to add programs to your homebrew channel.

I take no credit for this video.

http://youtube.com/watch?hl=en&gl=US...&v=AJ5IVkt1Q4s

Not much of a guide, but still a "how to" for the wii. Enjoy.