John Gruber sort-of defends Mark Pilgrim’s reasons for his [switch to Ubuntu](http://diveintomark.org/archives/2006/06/02/when-the-bough-breaks) and Pilgrim [responds](http://diveintomark.org/archives/2006/06/16/juggling-oranges) with some more lucid arguments for choosing open formats and Free Software if you want to retain your data for a long period of time.