So I thought I'd give Windows Live Writer a try. Not to shabby! I love the real time spell checking. When using it to connect to dasBlog, make sure you have the "Blogger/MovableType API" enabled in your dasBlog "Services Settings" section.

When setting up your account in Live Writer, select the "Another weblog service" weblog type when prompted. Then, when prompted for the provider, select "dasBlog" and set the "Remote posting URL ..." to be "http://www.mysite.com/blog/blogger.aspx". That's all there is to it.