First off, sorry if already posted, here are January-October US sales accordind to NPD, with LTD sales in brackets.

2011 - USA :
1. Xbox 360 – 3.839.214 – (29.234.373)
2. Nintendo DS – 2.843.732 – (50.180.001)
3. PlayStation 3 – 2.679.948 – (18.141.921)
4. Wii – 2.614.870 – (36.764.494)
5. Nintendo 3DS – 1.667.000 – (1.667.000)

In comparison vgchartz has the following numbers up until the 29 of October :

 Xbox 360 : 29.187.776 (slightly undertracked by 46.597)
 Nintendo DS : 49.257.979 (undertraked by 922.022)
 PlayStation 3 : 17.947.274 (undertracked by 194.647)
 Wii  : 36.413.503 (underdtracked by 350.991)
 Nintendo 3DS : 1.858.963 (overtracked by 191.963)

Now that vgchartz has an "USA chart" it is way more easy to compare with NPD.

LOL DS under tracked by over 900K, so we can see that DS is now over 150.5M LT WW.

3DS surpassed DS first year sales in US which did 2.37M so by looking at this we can see that 3DS as done over 700K in November.

actually we can even find under/overtracked which month

like 360 2011's VGC USA number=3511084,means undertracked 2011 but overtracked 2005~2010

Woah! Wii pretty undertracked! The little white box is doing very good!

NPD isn't perfect remember, they used to get data from 40% of retailers, with Wal-Mart now it is probably higher, but regardless they do extrapolate data.

But they ususally aren't way off either, they sometimes do stealth adjustments, I wonder if they've done some.