The Latest Distribution of Different Android Versions

Android Version/	Internal Codename/	Usage as on July 1, 2012/	Usage as on August 1, 2012
1.5	Cupcake	0.2%	0.2%
1.6	Donut	0.5%	0.5%
2.1	Eclair	4.7%	4.2%
2.2	Froyo	17.3%	15.5%
2.3.x	Gingerbread	63.6%	60.3% (-2.7%)
3.1	Honeycomb	0.5%	0.5%
3.2		1.9%	1.8%
4.0.x	Ice Cream Sandwich	10.7%	15.8% (+5.1%)
4.1	Jelly Bean	N/A	0.8%

Google has just updated their distribution charts for the Android platform and it suggests that 15.8% of Android phones and tablets have Ice Cream Sandwich installed. Gingerbread, the most popular Android version ever, still powers 60.3% Android devices though it was released way back in December 2010. [via]
The above data is based on the number of Android devices that have accessed Google Play within a 14-day period so it may not account for the Android users who do not have Internet on their phones (and this may not be a small set).