Quick 'n' dirty Japan comparison:
March 2 - 8, 2009
PSP - 59,568
PS3 - 39,835
DSi - 32,102
Wii - 16,560
X360 - 14,994
DSL - 11,240
PS2 - 4,954
Game Boy Advance SP - 48,936
PlayStation 2 - 43,248
GameCube - 8,389
Game Boy Advance - 4,204
Xbox - 839
PSone - 448
Wonder Swan Crystal - 363
For the same week in March:
Current-gen traditional consoles are about even (52K).
Handhelds are way up (53K vs 102K).
Last gen is hanging on more tenaciously (5K vs 0.5K).
Wii's...not very significant. I think Nintendo was banking on Wii Music and Animal Crossing. Unfortunately, they forgot to put content into Wii Music and forgot to put new content in Animal Crossing. The market's shown it's cool with last-gen production values, but it likes new, professional content.
It's incredible how long Mario Kart Wii, Mario Kart DS, Wii Fit, and New SMB have charted. Absolutely amazing.