Joe Friend: Word is a great tool for writing stuff, right? Blogging is all about communicating with words (and pictures, too). So, why not use Word to write your blog posts? [cut] In Beta 2 we support MSN Spaces, SharePoint 2007 (of course), Blogger, and Community Server (which is used for blogs.msdn.com). You can also set up a custom account with services that support the metaweblog API or the ATOM API. All the blog providers seems to interpret these APIs a bit different so there kinks we're still working out.
http://blogs.msdn.com/joe_friend/archive/2006/05/12/595963.aspx