I prefer both.. that is a nice video along with an accurate transcription and code samples directly below it. It's the best of both worlds..

example: http://railscasts.com/episodes/222-rack-in-rails-3

^ that's the kind of thing I'd whip out the plastic for any day of the week :)

she gives it away in this interview I believe: https://www.youtube.com/watch?v=UW8vbDLdlqU

in a word... "war-chest"