Sales figures from each console's launch datum through the end of July (and the end of August in Japan) were added up, with the Wii just barely edging out the 360: 9 million for the Wii, 8.9 million for the 360, and 3.7 million for the PlayStation 3.
It may be doing good, but (even though it's the most expensive) it still hasn't made as much money as past Nintendo consoles. It's probably just because it's newest... right?