PlanetEmacsen – An aggregation of the blogs of Emacs users.
M-x all-things-emacs – A place for both Emacs n00bs and hax0rz to gain a little more out of Emacs.
ElispCookbook – This page contains snippets of code that demonstrate basic elisp programming operations in the spirit of the o’reilly cookbook series of books.
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.)
Being Productive With Emacs - Part 2 (PDF) – Emacs Lisp for implementation, for customization and for extending Emacs. (Foundations of Emacs Lisp; keybindings, variables, hooks; the InitFile; defining interactive functions.)