This is more eye candy than anything else. The chart above states the obvious with HTC owning the WP7 marketshare (along with everything else) by releasing a horde of products. Samsung closely follows behind, surprising since they only offer a single device in America and Europe (Focus and Omnia 7 respectively) - albeit both devices are popular. ASUS is shown to have the smallest chunk of strawberry pie with their limited deployment along with Dell (although is Dell's position down to the hardware/software blunders?).
The chart below shows a device breakdown of popularity, HD7 being the most commonly owned product, followed by the Omnia 7, whey Europe! interesting to see how the hype of each product introduction correlates to the popularity post-deployment. Please note that these charts are estimates only and are by no means accurate.