An example from my init.org

gistfile1.el

* My Emacs Customizations
** The Vendor Directory

I keep all my non-packages in =.emacs.d/vendor=.

#+begin_src emacs-lisp
(add-to-list 'load-path "~/.emacs.d/vendor")
#+end_src

** Packages

We load melpa and marmelade packages here. They are
configured/required later.

#+begin_src emacs-lisp
(require 'package)
(add-to-list 'package-archives
	     '("marmalade" . "http://marmalade-repo.org/packages/") t)
(add-to-list 'package-archives
	     '("melpa" . "http://melpa.milkbox.net/packages/") t)
(package-initialize)

(when (not package-archive-contents)
  (package-refresh-contents))

#+end_src

Here we actually add all our packages.

#+begin_src emacs-lisp
  ;; Add in your own as you wish:
  (defvar my-packages '(color-theme
                        color-theme-solarized
                        color-theme-wombat
                        color-theme-ir-black
                        undo-tree
                        php-mode
                        yasnippet
                        js2-mode
                        dizzee
                        go-mode
                        xml-rpc
                        yaml-mode
                        pyregexp
                        virtualenv
                        flymake-cursor
                        magit
                        exec-path-from-shell
                        s
                        dash
                        monky
                        ido-ubiquitous
                        expand-region
                        helm
                        smex)
    "A list of packages to ensure are installed at launch.")

  (dolist (p my-packages)
    (when (not (package-installed-p p))
      (package-install p)))
#+end_src

Finally, we'll require and configure the simple ones.

#+begin_src emacs-lisp
  ;; python regex for search and replace
  ;; (require 'pyregexp)

  ;; magit
  (require 'magit)
  (global-set-key (kbd "C-c s") 'magit-status)

  ;; s string lib
  (require 's)

#+end_src