Just found an interesting video that might serve as a useful example of a Sublime Text demo video. It is the video in which Microsoft demo the changes going in to Visual Studio 2010 to make for faster HTML editing.
https://sessions.microsoftpdc.com/public/timeline.aspx, click 'asp.net', then video number PC33. At 24 minutes in, the presenter demonstrates how much faster it is to develop html with snippets over hand-typing.
It reminds me very much of the screencasts we've been seeing for Sublime Text. I think these videos serve as excellent demonstrations of what Sublime will do for you.