Well, Nintendo's fastest selling game is officially Brawl. Also, Wii sales just went up because there is a new reason to get a Wii.
The drive to get Wii's is much higher with Brawl out, but they are still nowhere to be found...
Super Smash Bros. Brawl Sells over 1.4M Copies, Becomes Fastest Selling Nintendo Title Ever - Shacknews - PC Games, PlayStation, Xbox 360 and Wii video game news, previews and downloads
Also, overall sales for each console:
But anyways, Nintendo is on top, and its going to take a lot of work for those other consoles to catch up.

Sources: Brawl Smashes Nintendo Sales Records | Game | Life from Wired.comNintendo said today that it sold over 1.4 million copies of Brawl in its first week of availability, including around 875,000 copies on the day of release, March 9.
Super Smash Bros. Brawl Sells over 1.4M Copies, Becomes Fastest Selling Nintendo Title Ever - Shacknews - PC Games, PlayStation, Xbox 360 and Wii video game news, previews and downloads
Also, overall sales for each console:
I'm not sure if this beats Halo, but I think America plays Halo more. XBox doesn't do so well in Japan. Plus, everybody has access to a XBox, not everyone has access to a Wii because they keep getting sold out. That would be the only reason Halo outsold Brawl.The Wii outsold the PlayStation 3 and Xbox 360, with the Nintendo DS reigning as the month's best-selling system. February hardware sales for the North American market were as follows:
1. Nintendo DS - 587,600
2. Wii - 432,000
3. PlayStation 2 - 351,800
4. PlayStation 3 - 280,800
5. Xbox 360 - 254,600
6. PSP - 243,100
But anyways, Nintendo is on top, and its going to take a lot of work for those other consoles to catch up.