Guys - check this out - it shows the natural trend for sales post Xmas:
http://vgchartz.com/hwcomps.php?cons1=Wii&reg1=All&cons2=PS3&reg2=All&cons3=X360&reg3=All&start=39061&end=39138

They peak around Xmas week, and immediately fall away (ignore the PS3 curve for now).

By 1st Jan, Wii sales halved - and 360 sales dropped by 2/3rds.

A week later, the 360 had lost another 30% of sales - and another 10%-20% a week after that.

Expect the same this year. The PS3 will settle to around 120k-150k/week, with the 360 similar (or maybe slightly lower) and the Wii around 200k/week.

If the PS3 ends up around 8.5m sold (likely), its going to take around 2 months to hit 10m sold (start of March) - with 11m-12m sold by end of March, depending on software released.

Anything more than that, will require a lot of "pushing" from Sony (another bundle, price cut, more software, etc...).

 11 mil by March 08 will be pretty good for Sony, but not at all by their financial statements.  That'd but them at the very least 2.5 mil short of their shipment goals.

I dont believe Sony can sell 11m till march 2008. All games that were coming Q1 2008 are moved to Q2/Q3. 11-8.5=2.5 for 3 months is pretty impossible for Sony. 10m sold till march 08 is possible if PS3 sales does not become horrible again, 500k/month.