On the portable front, DS has seen a large drop YoY mostly due to saturation, though the DSi has helped combat that as of late. The PSP has improved due to new SKUs and the fact that practically everyone already has a DS already.
On the console front, only the 360 has improved YoY. Console gaming just isn't as popular as handhelds in Japan anymore.
VGChartz Hardware data for the period 06th Jan 2007 to 01st Dec 2007:
Console | Wii | PS3 | X360 | PSP | DS | PS2 |
Japan
|
2,990,437
|
1,012,717
|
223,188
|
2,508,631
|
6,293,444
|
725,507
|
VGChartz Hardware data for the period 05th Jan 2008 to 29th Nov 2008:
Console | Wii | PS3 | X360 | PSP | DS | PS2 |
Japan
|
2,459,974
|
854,342
|
277,870
|
3,288,748
|
3,144,471
|
450,965
|