At launch, PS3 sold 0.19M
in 2 weeks in the US.
It took them about 50 days to ship 1 million units in NA
Wii sold 1.25M in the first 42 days in NA
Xbox 360 sold 0.9M units in the first 39 days
Didn't find any numbers for the PS2 launch, but here
Jack Tretton says they"
reach the one-million mark (with the Playstation 3) faster than our top-selling platform, PS2...".
EDIT: Hoho for breakfast points out
that in NA, the PS2 sold "slightly more than 0.5M"
in the first day.