ViolentPhlegm on 25 January 2010
I use the week when the lead console passed the trailing console's current corresponding total. So for this week, it would be the answer to the question, "When did Wii pass 9,683,737?" which was last week. This was explained in the New Years update.
Next week the gap will be 2 weeks, though, and this should increase substatially as time passes because while 115k lead only represented 1 week of sales in December, as sales decline, that same lead might represent up to 5 weeks of sales.
