My estimation of how much RE4 Wii Edition has sold uptil this day:
Japan:
Should be at around 100k. Was at 93k two weeks ago, but count in last week and the two days of this week, and we should have it at 100k.
100k
North America:
We know it sold shy of 150k in the US in July. Since Hardware in Canada is around 12% of what it is in the US, when it comes to the Wii, we can estimate and say that RE4 sold 18k in Canada in June. That's 165k for NA in June counting 10 days of that NPD month. RE4 has been out for 16 days in July NPD already. But here we have to make a wild estimate. Let's say that the game has sold 50k thus far during July NPD in the US. Add Canada (6k) and we get 56k. That's brings us to a total of 221k uptil this day in North America.
221k
Europe:
Again, wild predictions here. Lots of Wii games in Europe have the same attach ratio as they have in the US. The only difference is that the Wii has sold around 30% less in Europe than in North America. If RE4 has sold around the same, percentage wise, in Europe as in NA, it should be around 155k. So total, 155k.
155k
Others:
Australia/New Zealand and the Internet. Hard to say. The Australian market is around the same as Canada, but the Wii isn't as popular down there as in NA. So I estimate around 30k for RE4 down there. Internet sales are pretty much impossible to estimate, but if we look at the big picture they don't really matter since the Internet market isn't that big. But let's say it has sold 10k on Internet. So total 40k.
40k
Worldwide:
516k.
My estimations could be far off, but I think it's safe to say that RE4 Wii Edtion has already broken the 420k barrier.