Introduction: why Emacs?; overview of editing commands; macros; major and minor modes.
Emacs lisp: rebinding keys; hooks; extending Emacs with your own commands.
Older stuff - Seems to have moved
Being Productive With Emacs - Part 1 (PDF) – “Emacs is the extensible, customizable, selfdocumenting realtime display editor.” It’s a good Emacs tutorial. (Working quickly in Emacs; modes; macros; useful features; how to learn more.)