Save with Ctrl+S

* Save 750,000 keystrokes over a 10-year programming career.
  http://www.youtube.com/watch?v=SkdrYWhh-8s
* In order to make this work, disable XON/XOFF flow control.
  http://dallarosa.tumblr.com/post/31333511717/commandt-and-ctrl-s-on-mac-os-x

Hat tip, @r00k.