Emacs Lisp

Dave Pearson's Emacs Stuff
Some helpful Emacs packages.
http://www.davep.org/emacs/

Dictionary
Package for talking to a dictionary server.
http://me.in-berlin.de/~myrkr/dictionary/index.html

Easymacs
An easy-to-learn, one-size-fits-all configuration for new users of GNU Emacs. It sets up key bindings that conform to a common denominator of the Gnome/KDE/OS X/Microsoft Windows human interface guidelines, and provides function-key bindings for other powerful Emacs features. It also installs a number of packages useful for working with Latex and XML files that do not come with Emacs itself.
http://www.dur.ac.uk/p.j.heslin/Software/Emacs/Easymacs/

emacs at levana.de
Emacs Lisp software including etexshow (Browser for ConTeXt commands), recent files menu, tea timer, evening commander.
http://levana.de/emacs/

Emacs Code by Stephen Eglen
Various modes provided by the maintainer of the ELL.
http://www.damtp.cam.ac.uk/user/sje30/emacs/

The Emacs Lisp List
Collection of links to Elisp packages mostly not part of the standard distributions.
http://www.damtp.cam.ac.uk/user/sje30/emacs/ell.html

Emacs Lisp Packages by C.Queinnec
Descriptions and downloads for: defaultbanner, defaultcontent, foldingo, fracc, genconv, mousymacro, sigadapt, supertab, todo.
http://pagesperso-systeme.lip6.fr/Christian.Queinnec/WWW/elisp.html

Emacs Packages
Packages for: buffer selection and cycling by C-TAB; fast navigation through toplevel definitions; Gimp Script Fu; highlighting regular expressions, current word.
http://www.geekware.de/software/emacs/

Emacs Stuff
Emacs background with custom lisp packages, code snippets, and resources.
http://www.northbound-train.com/emacs.html

Eric Marsden's Download Page
Beside Common Lisp and Scheme files, various Elisp packages are available. Amongst others there is an implementation of the Internet Printing Protocol, a HTTP server embedded in Emacs, and a simple library for the Common Gateway Interface, which allows you to service requests for non static web pages.
http://www.chez.com/emarsden/downloads/

ESS : Emacs Speaks Statistics
Package provides support for many statistical languages such as the S family, SAS, or XLS.
http://stat.ethz.ch/ESS/

Flyspell
A package for on the fly spell checking.
http://www-sop.inria.fr/mimosa/Manuel.Serrano/flyspell/flyspell.html

FreeBSD Ports: Elisp
Emacs-Lisp packages for FreeBSD users.
http://www.freebsd.org/es/ports/elisp.html

Harley Gorrell's Elisp
Various modes for editing crontab files or DNA sequences, an addition to perl-mode, and footnote support.
http://www.mahalito.net/~harley/elisp/

Howm
A wiki-like note-taking tool on Emacs.
http://howm.sourceforge.jp/

Introduction to Emacs Lisp Programming
(Second Edition) Official Free Software Foundation manual.
http://www.gnu.org/software/emacs/emacs-lisp-intro/emacs-lisp-intro.html

Ispell.el
The development site which contains the latest beta releases of the Emacs interface to ispell not yet included into the standard distributions.
http://kdstevens.com/~stevens/ispell-page.html

Jerry Chen's XEmacs Lisp Hacks
Featuring multiple major modes in a buffer, a line number mode and a mode for displaying vertical bars.
http://www.geocities.com/gchen275/xemacs/

Lookup
Search interface to access dictionaries online from within Emacs.
http://lookup.sourceforge.net/

Malyon Interpreter
Major mode for playing z3/5/8 story files. A z-code interpreter written entirely in elisp.
http://www.ifarchive.org/indexes/if-archiveXinfocomXinterpretersXemacs.html

Martin Schwenke's Emacs Hacks
Including a mode for eiffel, a stand-alone version of gnuserv for GNU Emacs, and desire.el, a configuration helper package for Emacs.
http://meltin.net/hacks/emacs/

MMM Mode
A package to use multiple major modes in one GNU Emacs buffer.
http://mmm-mode.sourceforge.net/

Modes by Alex Schoeder
Latest versions of SQL mode, master mode, the ANSI color package, a copy of Tinytalk, and patches to comint mode and BBDB.
http://www.geocities.com/kensanata/emacs.html

Muse Mode
An environment that supports rapid creation of hyper-linked documents in Emacs, which may then be published to multiple output formats in an attractive fashion.
http://www.mwolson.org/projects/MuseMode.html

Noah Friedman's Elisp Archive
Collection of major and minor modes, user interface enhancements, and library routines.
http://www.splode.com/~friedman/software/emacs-lisp/

Online Journal Software for Emacs
This package allows you to keep an index to your personal journal.
http://sourceforge.net/projects/records

Programming in Emacs Lisp
Introduction into the world of elisp.
http://www.gnu.org/software/emacs/emacs-lisp-intro/

S. Zenitani's Emacs Lisp Packages
Emacs Lisp programs featuring smart-compile.el, an intelligent M-x compile, a-menu.el and mac-drag-N-drop.el. Also offers a Carbon/Mac OSX distribution of emacs.
http://homepage.mac.com/zenitani/comp-e.html

Session
A package to save various variables and registers which reflect your current editing state to a file which is loaded into your next session.
http://emacs-session.sourceforge.net/

Storm's Emacs Resources
Featuring cua.el, a package to provide the CUA Key binding for cut, copy, and paste without losing the normal Emacs key bindings. Also featuring ido.el, a package providing highly interactive versions of find-file and switch-to-buffer.
http://www.cua.dk/emacs.html

Template
Packages for auto-updating and file templates.
http://emacs-template.sourceforge.net/

Tiny Tools Library
Collection of packages to improve your Emacs environment.
http://tiny-tools.sourceforge.net/emacs-tiny-tools.html

Verilog Mode
A mode to edit Verilog HDL files with Emacs.
http://www.verilog.com/

Vinicius Emacs Page
GNU Emacs packages featuring printing support, highlighting whitespace and the current line.
http://www.emacswiki.org/cgi-bin/wiki/ViniciusJoseLatorre

X-Symbol
Get some kind of WYSIWYG in LaTeX and HTML source.
http://x-symbol.sourceforge.net/

Zenirc
Emacs as an IRC client.
http://www.zenirc.org/