Well, if you can read this then Adobe Contribute CS3 works with DasBlog, which is the blog engine I'm using. When you start Contribute for the first time it asks you to set up a connection. If not, you can select Edit, My Connections.. from the menu and click the Create... button.
Select that you connect to a blog, select Other Blog Servers in the second drop down and specify the URL to your blog. It should automagically find the /blogger.aspx web service file. Click Next, specify your username and password for the blog and you're good to go.
It looks pretty good, it picks up my categories, I can browse my blog in Contribute and just click Edit when I'm on a page I want to edit, it integrates with IE and Firefox, giving me a "Post to blog" button, I can insert documents as PDF and a bunch of other things. All in all, it looks pretty easy to use so I think I start using it to update my blog.
There is one thing I'd like to see though. The ability to just paste an image into the text and have Contribute automatically save the image along with my blog. That would be cool!
Edit: Worked like a charm. Uploaded image and everything. Sweet!