Dir structure (simplified):
  app1/static/js/file.js
  app1/static/css/file.css
  app2/static/js/otherfile.js
  app2/static/css/otherfile.css
  templates/template.html

Template.html:
  <script src="{{ STATIC_URL }}js/file.js"></script>

Project Root
Settings file
Manage.py file

STATICFILES_DIRS = (
    # ...
    ("resources", "C:/data/django/myproject/myapp/static"), )

<link rel="stylesheet" href="{%static 'resources/favicon.png' %}" type="text/css">

{% static "js/lib/jquery-1.8.2.min.js" %}