This weeks Japanese hardware sales

DSL 222,132
PSP 184,610
Wii 170,558
PS3 63,720
PS2 18,025
Xbox360 8,561
GBASP 103
GC 32
GBM 28
DS 12
GBA 9

Apparently the PSP debued a new color this week which is possibly the reason why it sold more than the Wii.

Source