Famitsu has published the japanese console sales numbers from the week of March 18-24. Here you go:

PS2: 85.370
XBOX: 5.005
GCN: 34.448
GBA: 40.345
PS1: 7.658
GBC: 2.439
WSC: 2.772

And here is a nice graph of the numbers:



The GameCube is gaining more and more territory. We will keep you updated!

TIM:
I think it is better not to start talking about the Xbox sales numbers in Japan... ;)