I just installed windows Live Writer with some sort of upgrade to MSN/Live Messenger. Live Writer is a great blog editor. All I had to do was put the url of my blog in the system and my username and password. I could open old posts. What was really cool is that I could insert a picture in to the editor and when I published the post it published the image along with it!
Live Writer supports MT, WordPress, Blogger and others.
If you run Windows you can download it here.