A common complaint amongst third-party publishers is that the only games which sell well on Nintendo consoles are Nintendo games. Which is mostly true! Unless you're Ubisoft.
It's been revealed that the single biggest-selling third-party game on the Wii is now (and is likely to remain, given the console's impending replacement) Ubisoft's Just Dance 2, which alone has sold 14 million copies.
You can see it in action up top. If you could choose only one story that would up the lifetime of the Nintendo Wii, I would hope this would be it.