Things Generalized Bookmarklet

gistfile1.js

javascript: (function () {
  var w = window,
    d = document,
    selectedTxt = w.getSelection ? w.getSelection() : (d.getSelection) ? d.getSelection() : (d.selection ? d.selection.createRange().text : 0),
    pageUri = w.location.href,
    isGMail = w.location.host.match(/mail\.google\.com/),
    subject = d.title,
    source, url;
  if (isGMail) {
    var msgFrm = d.getElementById('canvas_frame'),
      subjectSpans;
    if (msgFrm) {
      subjectSpans = msgFrm.contentDocument.getElementsByClassName('hP');
      if (subjectSpans) subject = subjectSpans[0].innerText;
    };
    if (!subjectSpans) {
      subject = d.title.substring(d.title.indexOf('-') + 1, d.title.lastIndexOf('-')).replace(/^ +/, '').replace(/ +$/, '')
    };
    source = 'From: email subject:(' + subject + ')\n';
  } else {
    source = 'From: '
  }
  if (selectedTxt != '') selectedTxt += '\n';
  url = 'things:add?notes=' + encodeURIComponent(selectedTxt + source + pageUri) + '&title=' + encodeURIComponent(subject);
  w.location.href = url
})();