Roflinator on 15 December 2008
http://vgchartz.com/hwlaunch.php?cons1=Wii®1=All&cons2=PS2®2=All&cons3=DS®3=All&weeks=156
It's outpacing the PS2. And if Nintendo decides to keep the Wii alive during the next generation (unlike the Gamecube, which died instantly), it's a definite it'll outsell the PS2.