From now until the end of the year the following will happen and you can all quote me on this if you would like:
Others - PS3 will beat the 360 every week untill the end of the year.
Americas - 360 will beat PS3 every week untilll the end of the year.
Japan - It will be close but the PS3 will win by on average 10K per week.
This will mean that it will be roughly a draw this Christmas.