Well, I don't know if people are still even bothering with registering codes any more, but after I got my Wii back from Nintendo with the ing memory wiped clean I lost all my codes and, worse, the 1500 Miis in the Mii parade which had built up since launch day. That was pretty disappointing as they were supposed to fix the memory issue and restore my files.
It now seems I have a new code so I'll add it here and change mine in the OP.