The cheat sheet includes a bunch of stuff like events and XHR, etc.
Maybe this guy is some kind of masochist but most people don't roll their own wrappers for these browser inconsistent features, they use a library. If you are writing new handling code for XHR and events constantly you're doing it wrong. Seriously.
http://www.scottklarr.com/topic/95/javascriptajax-cheat-shee...