CoffeeScript to include web fonts from Google. See how it compiles below.

google_webfont.coffee

window.WebFontConfig =
    google:
        families: ['Droid+Serif:400,700,400italic:latin']

wf = document.createElement('script')
wf.src = """#{if document.location.protocol == 'https' then 'https' else 'http'}
    ://ajax.googleapis.com/ajax/libs/webfont/1/webfont.js"""
wf.type = "text/javascript"
wf.async = "true"
s = document.getElementsByTagName("script")[0]
s.parentNode.insertBefore(wf, s)

google_webfont.js

(function() {
  var s, wf;
  window.WebFontConfig = {
    google: {
      families: ['Droid+Serif:400,700,400italic:latin']
    }
  };
  wf = document.createElement('script');
  wf.src = "" + (document.location.protocol === 'https' ? 'https' : 'http') + "://ajax.googleapis.com/ajax/libs/webfont/1/webfont.js";
  wf.type = "text/javascript";
  wf.async = "true";
  s = document.getElementsByTagName("script")[0];
  s.parentNode.insertBefore(wf, s);
}).call(this);