Since I last posted the number of Open With users has grown, quite a lot. So I thought I'd repeat my totally unscientific locales test and compare the results. There was a certainly surprise or two (hint: look at the big red bar in the middle).
In this chart, the Y axis is each locale as a percentage of the en-* locales, so for every 100 English users there are now 14.3 German users. (In the previous chart the Y axis scale is different so they don't match up.)

