I would like to use org-mode's contributed packages: http://orgmode.org/worg/org-contrib/
[EDIT] SOLUTION:
As per answer below: 1) First one should have the elpa packages added.
(require 'package) ... (add-to-list 'package-archives '("org" . "http://orgmode.org/elpa/") t) ... (package-initialize) This is described [here] in detail.1
2) Afterwards, below the lines above, one can add the desired modules like this:
(require 'org-checklist) WARNING
Some packages may be available in the git-hub repository but not yet in the official repository. (e.g org-eww at the time of writing). As such, requiring these will cause errors.
Before adding a requirement, it is reccomended to browse the folder:
~/.emacs.d/elpa/org-plus-contrib-<DATE>
~/.emacs.d/org/contrib, then you need to replaceCONTRIB_DIRwith"~/.emacs.d/org/contrib/lisp".org-plus-contribandorgwithrequireoruse-package.(add-to-list 'load-path (car (file-expand-wildcards "~/.emacs.d/elpa/org-*/contrib/lisp"))).