Thank you for the note. There is a large difference between slides used in a presentation and slides intended to be read like a book. With the former, it is pretty useless to have the slides out of context. With the latter, there is no need for the author to speak. Fortunately, someone posted a video to the presentation, a better link than the initial submission's (http://confreaks.net/videos/614-cascadiaruby2011-confident-c...).