Thanks for pointing me to this feature. I didn’t realize that Google Docs could do this. I haven’t tried it yet, but I noticed that if you go to the Publish tab there is a link to “set your blog site settings.” If you click that, it looks like you can change the Blog ID/Title. I guess you would have to do that every time that you want to post to a different blog. If you have more than one blog, it would be nice if they gave you a choice of which one to publish in.
I’m interested in your experience. How does it handle images and other files? I’ve been using Windows Live Writer a little bit, and it is nice, but I can’t get it to handle images and files the way that I would like (it insists on creating its own subdirectories).