I was collecting the available information together, and decided to share this.
Others (from the main page):
Wii: 244k
360: 105k
PS3: 157k
Japan (from TheSource's preliminary data):
Wii: 65k - 80k
360: 5k - 8k
PS3: 50k - 60k
USA (according to TheSource's hint that HWsales dropped 10%-25% from the previous week, in this thread):
Wii: 313k - 376k
360: 224k - 269k
PS3: 130k - 157k
Total:
Wii: 622k - 700k
360: 334k - 382k
PS3: 337k - 374k
For reference, the previous week was 637k for the Wii, 380k for the 360 and 339k for the PS3.
My Mario Kart Wii friend code: 2707-1866-0957