Facing the nearly dismal sales of the PS3 in the U.S., Japan and many other markets, Sony is scrounging for any good PR aside from their usual “it's the best thing ever”. They may have found some, down in Australia. While the total number of consoles sold in the PS3 still greatly favors other consoles such as the Wii, with about 100,000 units sold, the PS3's rate of sale is higher. According to Sony, of course. Wii may have beaten them to 100,000, but with 50,000 sold since launch in March they claim that it has outperformed the 360 and Wii week-to-week:

"Based on GfK since launch, PS3 has been the number one next-gen console, outselling Wii and Xbox 360 every week, except for last week," Ephraim said.
The Wii had nearly a four-month lead on the PS3 in Australia, so the story is very plausible. Whether or not they can keep the momentum up is another story altogether. If you believe the data from Nexgenwars, worldwide the Wii is quickly gaining on the 360 but the PS3 trails far, far behind both.

To Sony's credit, the PS2 remains the dominant console for sheer sales worldwide.