http://www.computerworld.com/action/article.do?command=viewArticleBasic&taxonomyName=Operating+Systems&articleId=9133570&taxonomyId=89&pageNumber=1
Also interesting to look at, it the Unix family chart: http://www.computerworld.com/common/images/site/features/2009/062009/unix_chart_775.jpg -- Manish Chakravarty http://manish-chaks.livejournal.com