Another piece of "marketing" collateral that can help popularize Emacs is a "tour of Emacs" video. Awhile back, I watched Russ Cox's "Tour of Acme" video and became an Acme convert as a result.

In the end, an editor is a productivity tool, and the best way to evaluate it is seeing it in action as part of a workflow: video is an excellent format to capture and share this with newcomers.