DreamsCast on 06 January 2008
For reference, vgchartz figures for black friday to the end of the month:
http://vgchartz.com/hwtable.php?cons%5B%5D=PS3&cons%5B%5D=PSP&cons%5B%5D=PS2®%5B%5D=America&start=39411&end=39446
PS3 - 1.05m
PS2 - 1.30m
PSP - 1.28m