David Wheeler has recently updated his article on Why Open Source Software / Free Software (OSS/FS, FLOSS, or FOSS)? Look at the Numbers! The article has use data for GNU/Linux in general as well as the Apache web server software in particular which continues to far exceed any other vendors market share including Microsoft. Many other metrics are also included in this quantitative paper. Linux Medical News first reported on this article in July 2001. Thanks to J. Antas blog for the link to the update.