http://vgchartz.com/hwlaunch.php?cons1=Wii&reg1=All&cons2=PS2&reg2=All&cons3=X360&reg3=------&weeks=80

That's basically all you need to see. If, however, that's not enough, I'll spell it out:

Nintendo has increased production for the Wii more than twice as fast as any other home console. (The red line represents the PS2, not the PS3.)

Let's put this in perspective. Imagine you're on the board of directors at NCL in Japan. It's July 2007, and you're doing a quarterly review of the period from April through June. Holiday 2007 is just around the corner. Look back at that graph, and erase the blue line all the way back to the 8.9m mark (this is where sales were at the beginning of July). Now you have to make a prediction. Based on what's happened in previous generations, and based on information you have regarding demand for the Wii, by how much do you increase production? Knowing that the more you increase production, the more each unit will cost, and the more chances for quality control issues to arise, how high do you decide to go and hopefully not overshoot too far?

Nintendo's answer to that question was to increase production to an amount that would result in more than twice the rate of adoption of any previous home console.

Did they produce enough units? No.

Was their decision to increase production to "only" 1.8m per month foolish? Well, that's an opinion question. Was the decision "ultra conservative" or "way too careful" or "classic Nintendo, playing it safe"? I think the data answers that question.

Just a tip Ent: make the third line PS2 or Wii. It just overlaps the other line you've made and effectively makes it a 2 variable graph.

Also, you are correct.  

Yeah. I wanted it to be red, though, and the green ends up overwriting the red. Call me picky or OCD I guess. :)

You can also set a line to show "-", ie nothing.

The wii is a lot more complex to construct than your average PS3 or 360, what with motion sensitivity. I think that 1.8 million is enough to supply demand without the factories overproducing the wii, causing the technology to not work with maximum efficiency.
I don't know much about the topic though, but I'm sure quality control must come into it somewhere.
Correct me if I'm wrong on this statement, because I'm not sure if I'm right or not.

I appreciate the help, but: 

Already tried it.  No dice. 

Well the success that Nintendo is having right now ia on a whole different level than any other console has ever experienced. It's hard to navigate waters when you are the pioneer that's exploring them for the first time.

Oh, I see now. It appears that just choosing "-" as console does not make the line disappear. However, if you choose "----" as region, it will work (and then console chosen makes no difference).

Hey, kickass.  Link edited.  :)

I could tell last April that the wii would be able to sell 20+mil in just the United states by Jan 1st. Their mistake was looking at the rate of only the start of the PS2 and not the entire life cycle combined with the immediate sell outs. So their info was 10 years old and the market had grown a lot and they were going after a larger market.