Quantcast's May mobile OS numbers are out and while Apple's iOS definitely continues to dominate, there's a rather prominent trend line forming towards Android. The data is compiled based on a share of pageviews, or as they say;

"This is share of pageviews from mobile devices based on the billions of mobile originated pageviews we observe each month through Quantcast Measurement. This is not the same as the number of devices, however we believe that the ability to easily browse the web is a key leading indicator of the long term position of the various platforms."

The data includes all of the iOS devices except the iPad, so that may also have something to do with the numbers, but the reality is that even with the iPad added into the mix, it's clear that Android has solidified itself as a solid, widely-accepted mobile OS.

More chart goodness is over at Quantcast