The title is an obvious pun. I just came by chance with a comment in Slashdot, where somebody explains why Mac OS X uses Quartz instead of X. First interesting thing is the comment is very well explained and justified, second interesting thing is that the comment is very documented: the person who wrote it is the same person behind Quartz (this makes obvious his bias). It is refreshing to find out that well informed people post in Slashdot, something I started to believe that did not happen.