Sure, Nintendo is selling a million-billion Wii's (though they don't take a loss on them), but their software attach rates aren't as high as they could be.
Sony is moving even less software. Microsoft has no problem moving software and it shows.
Apparently, about 52% of Xbox 360 owners that live in the United States own Halo 3.
Compare this to Super Mario Galaxy, which has only been out for a few weeks, and its attach rate of 18.7%. We'll give Galaxy time to catch up, though.