French firm XitiMonitor has published an update to their browser market share data, focused on Europe. Unfortunately, it's in French only, but the July update is was available in English (PDF format) for those who want to get a better gist. There are now 6 European countries above 30% market share: Slovenia (approaching 40%!), Finland, Slovakia, Poland, Czech Republic, Germany and Croatia.

Market share data in Europe, week of August 28th, 2006, according to XitiMonitor.com

As we can see, Europe and Oceania are leading the way in terms of Firefox market share worldwide:

Worldwide Firefox marketshare

I suggest that if you want to help Xiti improve the accuracy of the data, you use their service. They offer a free (as in "free beer") service in English, French and Spanish. (Of course, you may also want to use a non-free version of their services, too!)