Previous GfK data:
2007:
March:
PS3 - 54,500
360 - 252,500 (LTD)
Wii - 202,000 (LTD)
April:
Wii - 20,000
PS3 - 16,000
360 - 9,500
Link
May:
PS3 - 13,000
360 - 8,000
Wii - ???
June:
Wii - 43,000 (May + June)
PS3 - 8,000
360 - 5,000
July:
Wii - 26,000
PS3 - 8,000
360 - 5,000
Link
August + September:
Wii - 70,000
PS3 - 35,500
360 - 35,000
October:
PS3 - 37,000
Wii - 28,000
360 - 12,000
LTD (Oct 07):
Wii - 389,000
360 - 328,000
PS3 - 172,000
Link