what I find odd, is how the X360 leapfrogged in total usage minutes.
earlier in the year
PlayStation 2: 23.7%
Wii: 20.7%
Xbox 360: 18.2%
PlayStation 3: 9.0%
Now
Xbox 360 – 23.1%
PS2 – 20.4%
Wii – 19.0%
(no info for PS3 in the link)
this would indicate that people are moving on from PS2 to X360, along with a lot less Wii playing. Based on userbase size in NA you would expect the Wii to easily take the lead.