AdMob Mobile Metrics is a new report with market level data, which mobile industry professionals and publishers alike might find interesting. They
store and analyze the data from every ad request, impression, and click
and use this to optimise ad matching.

Every day, they see ad requests
from more than 160 countries and each month, they analyze this data to
produce the AdMob Mobile Metrics Report covering manufacturer, device
and country-specific data on AdMob’s top four markets by impressions
served: US, UK, India and South Africa.

You can download the full report for free here …

… but if youre just after a snapshot, heres the executive summary:

• 25.0% of ad requests in the AdMob network worldwide were from Smartphones.
• US requests grew 5.1 percent April over March to outpace network growth.
• The
  RAZR V3 and Nokia N70 retained the top device spots in the US and
  India. The top devices also remained the same in the UK (SonyEricsson
  K800i), South Africa (Motorola v360), and Indonesia (Nokia 6600).
• The Amoi 8512 – Three Skype phone – made its entrance as the number 5 device in the UK with 2.7 percent of UK traffic.
• The iPhone moved into AdMobs top 20 devices Worldwide.

Publishers
want to better understand mobile data use by operator and by device to
target their content and optimize their site performance. Advertisers
want to understand demographics and device capabilities as they plan
their campaigns.