This post was created with the recently released Windows Live Writer Beta 2. It supports multiple providers out of the box, it works with WordPress, Windows Live Spaces, and TypePad. However, you can expand it by using Provider Customization API. That exactly is what Scott Hanselman did for DasBlog. Read Scott’s Windows Live Writer Beta 2 – DasBlog and the Customization API post for more details.
As I created this post, I had one problem when I tried to open my existing posts from WordPress. I got ArgumentOutOfRangeException.