Here are the iOS version statistics for May 14th 2012. The poll was taken over April 14th to May 13th.

14 Oranges Wheel Graph iOS Statistics May 2012

We were expecting a faster uptake in 5.1.1 which came out a week ago but so far only shows up as 3% of users. We expect that by next month, it will taken over.

UPDATE: You can view the latest stats here

iOS Version Statistics – May 14th 2012