I had a mini sd which came with my sidekick 3 and i used the adapter that came with my 2 gig one and that worked fine. Since it was just lying around i always keep that in my wii. Its only 64 meg but thats fine. Id rather have my 2 gig in my sidekick anyway. Especially after i learned about how you can make themes for the sidekick now.
Id really like to customize my wii but not sure what im gonna do yet, whether its just paint or a window, lights.... not sure. Dont wanna ruin it.