According to Pich Media, the percentage of iPhone users running their phones jailbroken has gone up a little in the last week reported (week of 7/26/09). This week it rose from 8.0% to 8.43%. The last time I remember looking at the figure, a few weeks back, it was a little under 7%.
I wonder how much of this little rise might be attributed to the removal of GV Mobile from the App Store, and all the controversy it caused last week.
Pinch Media provide analytics and tracking for thousands of iPhone apps, as well as a wealth of useful information and statistics for the rest of us.