I am writing this post from Window Live Writer. It seems to be all over the blogosphere this morning, so I thought that I would give it a shot.
Installations was a breeze, but you are unable to specify an installation directory, so those of us who install programs on separate drives are SOL.
Setting up the blog was even easier than the installation. All you need to do is type in the URL and Windows Live Writer does the rest.
There are three interfaces for composing. There are two WYSIWYG. One is an HTML(link) preview with the styles from your blog and the last one resembles a simple word processor. The third interface is the classic HTML(link) view. WLW also has preview and spell check functions which PFF, my preferred tool, does not.
I will update this post once I have published it, just to let you know if everything came across alright (unlike my post from Office 2007 Beta).
UPDATE 2: The image uploads are a little wonky. For WordPress is loads to the correct directory (i.e. uploads/2006/08), but there it creates a sub-folder based on the post title and another folder to contain the thumbnail and the original image. This in itself is not a huge deal, but is makes these uploads inaccessible through the web admin panel.