Google's numbers presumably only come from tablets running Honeycomb accessing the Market. Which means non-Honeycomb tablets (which have been out a lot longer, have greater penetration in non-US lands, etc etc) aren't counted.

I can't find any recent stats, but as of March 2011, the Nook Color sold 3 million units. Way ahead of the 0.9mil quoted in the article, and it's only for one device.

Nook color ain't a tablet per se. Or is it?

Makes me think, why can't we count ipod touch as a 3" tablet?

B&N call the Color "The Reader's Tablet", so I think it counts.

I think the main difference wrt the Touch is size: if it can easily fit in a normal pocket, it's a PMP; if it can't, it's a tablet.

Lots of numbers out there - sold to retail, sold from retail to consumers, activated, etc.

I'd love to see numbers of actually used tablets, frequency of use, or numbers of sold applications to unique devices (assuming that such data would be sufficiently anonymized so as not to be privacy invasive to end users).

I believe that, historically, all of Google's numbers have been for devices activated. Just as a random example: http://www.pcworld.com/article/231306/500000_android_devices...