Apple's iPad outsells Android tablets by 24-to-1
bizjournals.com
bizjournals.com
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.
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).
Makes me think, why can't we count ipod touch as a 3" tablet?
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.