they've been doing shipments once every two weeks. Thusly they nearly sell out in one week, then the next week is scraps.
Amusingly when the numbers came up I thought the wii only sold a bit over 100K and I thought "wow, much lower than I would've expected It's not outselling PS360 combined". But I was looking at the DS. The wii is actually kicking everything's ass and then writing down it's name (presumably so it can return later to kick it's ass again). After Japan it will have outsold PS360 combined with room to spare.