The new Windows Live Writer, the new son of the Windows Live family that permits you to post on Blogs, seems really extremely interesting 
The Word 2003-like interface is really nice and the features are really a lot (nice the integration with Live services).
It has all the chances to become my official tool for blogging...
P.S. a little strange behaviour with .Text and a blog domain that starts with www (like mine). When you choose the MetaWeblogAPI provider, you've to provide the address in the form http://demiliani.com/blog/services/metablogapi.aspx
and not
http://www.demiliani.com/blog/services/metablogapi.aspx
(I use the www prefix with other blogging tools such as BlogJet or PostXING).