Here is the link to Readme Driven Development by Tom Preston-Werner
Excellent cast. Here is a link to the Engine Yard Blog mentioned in the screen cast.
It looks like you blog-after directory in the source code is not updated with the format_url method.
But I believe that screencasts that help people to grow the community like creating ruby gems should not be PRO screencasts.
blog_after and blog_before are not updated in download package
Just an FYI, I had to add Rake as a dependency in my .gemspec file. I was using Bundler 1.1.3 when I worked through this episode.
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