Here is a nifty Wii trick I never would have thought of: since you can save your games to an SD card, it's a simple thing to then trade your game saves via that SD card. So you put the game save file ...
Will Nintendo ever "get it" when it comes to online account/game management? They haven't in the past seven years since the first Wii was released. I don't see them getting it anytime soon, either.