CÃ©dric Savarese has a demo of using XUL to make a richer HTML form. CÃ©dric’s approach is different than my XUL-in-Internet Explorer idea. His method only uses XUL in a XUL-enabled browser (Firefox, SeaMonkey or Netscape). In other browsers, it falls back to DHTML elements.
One of the neat things about his approach is that it showcases how Mozilla-based browsers can create rich web interfaces without any extra plugins.