I don't have specific dates 'cause that would obviously vary depending on region and store, but Nintendo said they would be shipping at least 250,000 per week through the holiday season. I think that's the pessimistic estimation 'cause if the numbers at NexGenWars.com are even slightly accurate, then they would be shipping out plenty more than that.
I think Nintendo didn't want to pull a Sony and give a number that's their "goal number of units". PS3 really only had around 250,000 of the 400,000 units they said they would.
Anyways, Google News and Digg.com are great places to get the latest news/info on the Wii. Doubt any of this post helped you but... yeah.