eFluxMedia's Alice Turner apparently has seen the preliminary sale numbers for Xbox 360 since Halo 3 launched and reports:
"Prior to [Halo 3's] launch, the analysts estimated that Halo 3 would boost sales to around 400,000 Xbox 360 units, an important benchmark in an off-season sales month...
... if the preliminary numbers are correct, then Microsoft might even exceed the 400,000 units anticipated and at the same time will overtake the Nintendo Wii during the holiday season."
[Turner previously speculated that Halo 3 would not be capable of fueling Xbox 360's sales. See the first alternative link for her previous article, titled "Why Halo 3 Record Sales Won't Save Xbox 360."]