Google has added an application stats dashboard to Android Market. The new dashboard summarizes each app’s current download numbers, as well as each app’s distribution across Android platform versions, devices, countries and languages and shows aggregate distribution for all app installs from Android Market
“Application Statistics is a new type of dashboard in the Market Developer Console that gives you an overview of the installation performance of your apps. It provides charts and tables that summarize each app’s active installation trend over time, as well as its distribution across key dimensions such as Android platform versions, devices, user countries, and user languages. For additional context, the dashboard also shows the comparable aggregate distribution for all app installs from Android Market (numbering in the billions).”
More: http://android-developers.blogspot.com/2011/03/application-stats-on-android-market.html