Source - Joystiq
While the Nintendo DS continues to experience shortages in Japan, the PSP remained on top of Japanese hardware sales chart, this according to research group Media Create. Nintendo plans on replenishing DS supply by the end of the month, so it should be interesting to see how the restock effects subsequent charts.
Japanese sales (units sold) the week of 1/9/2006 - 1/15/2006:
PSP - 57,686
NDS - 54,284
PS2 - 39,076
GBASP - 9,982
GBM - 6,341
X360 - 6,107
GCN - 5,465
GBA - 233
XBX - 119