PlayStation 2 outselling Xbox 360 in US

From Arstechnica:

"Since the release of the Xbox 360, Microsoft has averaged 246,000 console sales each month in the US, while the PS2 has seen an average of 473,000 units—a number bolstered by an estimated 1.5 million sales in December alone. Leaving out December, Sony's average drops to 302,000 per month, still outpacing the Xbox 360 by a healthy margin."