Check out Justin Taylor’s recent interview with Os Guinness on the 25th Anniversary of Francis Schaeffer’s death: http://theologica.blogspot.com/2009/05/interview-with-os-guinness-on-25th.html.
I also recommend Guinness’ book review of Frank Schaeffer’s memoir, Crazy for God: http://www.christianitytoday.com/bc/2008/marapr/1.32.html.
Josh's Blog 