Your comparison is not completely accurate. Don't forget that the PS3 just came out in Europe, so it has a positive influence on the sales, especially the "3 last months" sales.
It seems obvious that it will never surpass the 360 in US, as for the Europe, like I said, it's hard to determine since it just came out and it's normal that it sells more because of that. And for Australia, I doubt the PS3 will still sell in 20 years.