This bookmarklet shows what milestone each issue is assigned to. Very handy when moving a bunch of issues into different milestones. Github - can you make this default behaviour on Github?

github-issues-milestones-bookmarklet.js

javascript:$('.issue-list-item').each(function(n, dom_issue) {
  var id = dom_issue.id.match(/issue_(\d+)/)[1];
  /* Create your own here: https://github.com/settings/applications */
  var token = 'SECRET';
  $.get('https://api.github.com/repos' + window.location.pathname + '/' + id + '?access_token=' + token).success(function(issue) {
    if(issue.milestone && issue.milestone.title) {
      var $issue_number = $(dom_issue).find('.list-group-item-number');
      $issue_number.text('(' + issue.milestone.title + ') ' + $issue_number.text());
    }
  }).error(function(e) {
    console.log("error for " + id);
  });
});