Complete Japanese hardware sales for April

PSP – 380, 697
Wii – 187, 121
DS Lite – 169,911
PS3 – 37,676
PS2 – 34,312
Xbox 360 – 8,193

While Nintendo had a fairly impressive month, the PSP overtook the apparent invincible DS Lite. Moreover, the PSP managed to sell more than double the amount of Wii units moved in April.

Source