gist-ubiquitifier.user.js

// ==UserScript==
// @name           gist-ubiquitifier
// @namespace      http://d.hatena.ne.jp/darashi
// @description    adds link to Gist Ubiquitifier on gist
// @include        http://gist.github.com/*
// @include        https://gist.github.com/*
// @version        0.0.0
// ==/UserScript==

var target = document.getElementById("gist_meta");
var id = self.location.href.match(/^https?:\/\/gist.github.com\/([0-9]+)/);
if( target && id )  {
  var element = document.createElement('div');
  var ubiquityUrl = "http://ubiquity.s21g.com/"+id[1];
  element.innerHTML = "<h3>install via <a href=\"http://ubiquity.s21g.com\">Gist Ubiquitifier</a></h3><a href=\""+ubiquityUrl+"\">install this via Gist Ubiquitifier</a>";
   target.appendChild(element);
}