What is this?
This is not a copy of the Emacs manual, or the elisp reference.
This is a list of all functions, variables and faces defined in the latest Emacs version, with links to their respective built-in documentations. This documentation is the one you get by calling describe-function, describe-variable or describe-face.
Wait, so everything in here is already inside Emacs?
Yes, the information contained here is easily accessible from inside Emacs. In fact, it is generated directly from the latest stable version of Emacs.
Then what's the point?
The point is that this information wasn't available anywhere online. Many functions are documented in the elisp reference, and others are explained in the Emacs manual, but most weren't described anywhere at all.
By making it available here you can easily link to it from your geeky Emacs blog (see Endless Parentheses or lunarsite, for instance).
I frequently missed having this information at hand, because even when I'm away from the computer I'm usualy thinking about Emacs (obsessive, I know). That's why I decided to make it available somewhere outside Emacs.