Remember that the units that Nintendo ship (DS and Wii) aren't all that they produce a month... basically their financial reports state that they are putting out about 1 million a month (up until March) that means 100,000 units is being put aside each month to contribute to the christmas time stockpile (it is stupid for a company with such demand to do it or they will not capitalise on christmas sales). They will also be taking a chunk off the top of the DS as well, i'd say more than 100,000 units a month and with increased capacity more than this. I can see DS and Wii going incredibly insane this christmas period, there will be at least 2 million units in around the world from the stockpile and also from that months production for Wii (so maybe 3million available world wide for christmas?) DS I really don't have much of an idea this year, I think last year will have been bigger, but who knows, Japan might continue to be huge again in Japan this Christmas (DQIX)
