A short screencast demonstrating the use of Rinari (an Emacs minor-mode for rails development). This video was produced using the emacs-starter-kit available at

github.com/technomancy/emacs-starter-kit/tree/master

and rinari available at

rinari.rubyforge.org/

(sorry there is no soundtrack)
(this entire video is produced using open-source and free [as in speech] software)