Android Froyo was dethroned as the most popular Android version recently and Gingerbread-running handsets became more and more popular. They now account for more than a half of all Androids out there. Gingerbread versions from 2.3.3 and higher are the most common ones and this is good news for those fearing fragmentation on Android.
2.1 Eclair with 9.6% but on the way out.Froyo now accounts for just above a third of all Android devices, and the third most popular version is Android
1.3% and 0.8%, but as rare as they are, they are still comparable to the tiny share of Honeycomb tablets which stood at a mere 2.4% of all devices running on Google’s platform. All pre-Eclair versions combined, including Honeycomb, make up less than 5% of all Androids.
The stats released by Google every two weeks are based on devices accessing the Android Market throughout that period.
source: Android Developers