TWRoO on 20 December 2008
The 360 being lower shouldn't come as a suprise, it is highly dependant on the American market, which gives it a bigger comparative boost in December, but a bigger drop into January.
January sales in Japan remain high, so Wii/PS3 will drop less worldwide because they are more viable there. (The effect maybe lessened this year with the 360s increasing importance in Japan)
European markets seem to follow America in terms of timing, but on a smaller scale in terms of holiday boosts... an exception I think is Spain, for which there is some festival/holiday in early January that keeps sales high like Japan.
