The web interface to MovableType is pretty good. Good enough that most people (including myself) haven't looked for or even known that there was another option. I recommend downloading Firefox 2 (though it's not necessary) and getting the free Performancing plugin. I'm going to try it out, you may want to also.
The URL to configure in Peromancing is http://mt.cementhorizon.com/cgi-bin/mt-xmlrpc.cgi