This is a ShowOff presentation (http://github.com/schacon/showoff)

If you want to see it, you need to install showoff and then run
it in this directory:

  $ gem install showoff
  $ git clone git://github.com/schacon/ddd.git
  $ cd ddd
  $ showoff serve

Then you should be able to go to http://localhost:9090 to view the
presentation.