Following Android 2.2 is the 23.7% of Android devices powered by Android 2.3.3 and the top of the line 2.3.4. One of the major differences between the two is that the latter is enabled for gTalk video chat. 15.2% of Android powered phones and tablets still run Android 2.1 while the 2% of Android 1.6 follows.
The survey was conducted over a two-week period ended August 1st, 2011 and shows that of the tablet optimized Honeycomb builds, Android 3.1 has the largest share among all Android devices with .7%, followed by the .4% of Android 3.0 and the .2% of Android 3.2
As more phones get updated to Gingerbread, we should continue to see Froyo's percentage drop while Gingerbread eventually takes over the majority of Android models. By that time, Ice Cream Sandwich should start to appear in a small number of phones.
source: Google via AndroidCentral
Despite losing 10% of its share of Android phones since the last survey, Android 2.2 still is in the majority of Android handsets