





From: http://metrics.admob.com/2010/02/january-2010-mobile-metrics-report/ and http://metrics.admob.com/wp-content/uploads/2010/02/AdMob-Mobile-Metrics-Jan-10.pdf
Here are the average percentage of users who download at least one paid app per month
iPhone : 50%
iPod touch : 35%
Android : 21%
webOS : 24%
Here are the number of free and paid apps downloaded on an average from these different platforms
Free app downloads
iPhone : 7
iPod touch : 10.5
Android : 7.6
webOS : 5.1
Paid app downloads
iPhone : 1.8
iPod touch : 1.6
Android : 1.1
webOS : 0.6



North America Handsets

U.S. Handsets



From: http://metrics.admob.com/2010/01/december-2009-mobile-metrics-report/ full report at http://metrics.admob.com/wp-content/uploads/2010/01/AdMob-Mobile-Metrics-Dec-09.pdf
Highlights from the November 2009 AdMob Mobile Metrics Report include:
More than 3 billion apps have been downloaded from the app store, 9 months after they hit the 1 billion milestone and 3 months after hitting the 2 billion milestone.
At the time that 2 billion were downloaded, the app store had 85,000 app, but in November 2009, they hit 100,000.