http://boston-technology.com/mobile_app_dev.html

Mobile OS Fragmentation Let’s start with the big dog, Apple’s iOS. According to a sample of Bump’s users between January 7 & 10 this

year, here’s a breakup:

Now look at Android’s fragmentation:

http://boston-technology.com/mobile_app_dev.html

And what does Android 2.3 have that 2.2 doesn’t? Here’s a

partial list:

SIP Communication

Near Field Communication (High Frequency High Speech

Data Transfer in short range)

Audio, graphical, and input enhancements for game

developers

Gyroscope support

Support for multiple cameras

Source

http://www.readwriteweb.com/mobile/2011/01/what-percentage-of-iphone-owners-are-on-ios4.php

http://developer.android.com/resources/dashboard/platform-versions.html