Classic issue of "how do you measure the penetration of open source". I've been installing Firefox as part of my distribution's packaging system for the last f

Classic issue of "how do you measure the penetration of open source". I've been installing Firefox as part of my distribution's packaging system for the last few releases. Since this is a download from a distro mirror, Firefox can't really include these statistics, but merely estimate. I'm not sure this qualifies as "interesting math". On the other hand, the only place to legitimately get Internet Explorer is from Microsoft, so it's easy for Microsoft to count.