Whatever agency you use, NPD, VgCharts for Americas, M-Create, Famitsu for Japan, or Chart-Track for Europe, Wii is outselling 360 everywhere - no exception as far as I know - for all of 2007.
Worldwide, according to VgCharts, in 2007 Wii is outselling 360 at a rate of 125,000/week. NPD data was within 5% for VgCharts Wii data, while VGcharts overestimated 360 by over 30%...
That means Wii is probably at 8.13 instead of 8.17 through Jun 10, while 360 is probably at 9.94 instead of 10.00 through June 10.
9.94-8.13= Wii's position behind 360 worldwide = 1.81 million
1.81 million = 125,000x, where x = weeks
Wii catches 360 in 14.48 weeks from June 10 at that rate. Even with GTA, Halo 3, etc, 360 will need to sell 500k units more per month than Wii just to avoid being outsold by Wii at current rates.
I don't know where you get two years from. 360 had a 12 month lead over Wii, which amounted to, at most, 7 million units, now that lead is down to under 2 million units.
Remember too that NPD data is only through June 2. Two weeks have gone by in real time, so Wii is more like 1.6 million behind 360 as of this very moment.
People are difficult to govern because they have too much knowledge.
When there are more laws, there are more criminals.
- Lao Tzu