I've heard about this Wii Homebrew Twilight hack thing that lets you go region free with your Wii, from what I've gathered it's not altering or messing around with the Wii's firmware or anything like that, it's just a program of sorts that you run before popping in a game from another region, sort of in a sense like a freeloader disc.
I'm sort of curious about it, I might look in to it seeing as I'd love to get Tatsunoko vs. Capcom and well buying a Japanese Wii just for that is a bit too much.