http://www.codinghorror.com/blog/2007/10/software-branching-and-parallel-universes.html
Linux adoption
http://arstechnica.com/open-source/news/2009/03/french-police-saves-millions-of-euros-by-adopting-ubuntu.ars
Wine
http://winebottler.kronenberg.org/
http://wiki.winehq.org/MacOSX/Building