I feel that talk made an impression on many people. I think that talk made live editing "mainstream" and Bret "stole" the concept by doing a good show just like Apple does. It's been done for years but no one "bothered" making a good show/product that wowed people.
From the top of my head (fluxus) [1] and impromptu [2]. And I bet every game company have their own live editing tools.
Anyway, </rant>.
What inspired me was this video of Iq's live coding setup [3] from last year. Months later I made a webgl version [4] to help spread glsl know-how. Then doing the HTML/CSS/JavaScript one was just natural de-evolution :)
[1] http://www.pawfal.org/fluxus/
[2] http://en.wikipedia.org/wiki/Impromptu_(programming_environm...
[3] http://www.youtube.com/watch?v=9g8CdctxmeU
[4] http://glsl.heroku.com/e