Valentino has the scoop about spiegel.de browser statistics:

The latest browser and OS statistics for SpiegelOnline, one of or maybe THE most visited German news website (and one of the major websites worldwide according to the Netcraft statistics) is showing the huge impact of Firefox on the browser market, and the continuing, undamped crumbling of the Internet Explorer dominance.

(...)

According to this website, Firefox is meanwhile outrunning Internet Explorer by 46.4% to 41.99% on the weekend, when users can use the software they like. Weekdays, Internet Explorer is still in the lead with 53.24% over 38.34% for Firefox obviously because a lot of users are stilled forced to use IE in the office.

(I have added links to the actual data).

Hat tip to Paul for the link!