The OpenLiveWriter project has just released a new version, it now works with blogger ! I am using it to write this post as well. Download the new version from the site and run the installer. During the installation, choose Google Blogger as your account type if you want to use it with Blogger.
The installer will prompt you to sign in, and will open up the authentication page on your browser.
Once you grant access in the browser, return to the installer to finish.
Awesome ! It works, and the interface is pretty much the same as Live Writer (though I found the tags option missing).
Hearty thank you to the good folk at the OpenLiveWriter project !!