I have a massive routes file on an app I'm working on right now, and it has several namespaced sections, so this episode was just at the right time!

One thought, though.

Instead of: draw :filename, "sub_path", why not use: draw "sub_path/filename" ?

Putting the sub_path as a param after the name seems slightly confusing to me.  When I want to know "where" the file is, it's easier to see "sub_path/filename".  Just a thought!  I found this episode very helpful.