How much more? Well, the Wii sold 171,851 units in the four weeks leading up to July 27th (so, really, it could've sold a lot more last month), while the PS3 only sold 54,823 units. And, as one might expect, both totally crushed the Xbox 360, which only sold 14,439 units.
We expect that the NPD data in the next few months will reflect something similar, as all of us in North America are still waiting on Wario Land: Shake It! and Mario Super Sluggers. Both of those, as well as Fatal Frame IV, have already released over there, but they pretty much don't count here as Wario and Fatal Frame released only yesterday. Sluggers released way back in June.