The largest number of Android users, 45.6%, are sporting a device running on Gingerbread. Specifically, 45.4% are using Gingerbread 2.3.3 to 2.3.7. Android 4.0, Ice Cream Sandwich, actually had a small decline and is now on 29% of Android devices from 29.1% last month. This could indicate that Android 4.0 has peaked and that Jelly Bean, which rose 3.4% in usage over last month, is on the way up.
The sad part of the distribution statistics is the large number of Android users that are still using Gingerbread and the 8.1% still on Android 2.2 (Froyo). That means more than half of Android users still are using a device with Android 2.2 to Android 2.3.7 on board.
source: AndroidDevelopers via TheNextWeb