For the adventurous, Microsoft has announced the Beta version of  
Windows Live Writer, now available for download: 


Windows Live Writer is a desktop application that makes it easier to  
compose compelling blog posts using Windows Live Spaces or your  
current blog service.


Writer is a great client for Windows Live Spaces but also works with  
other weblogs including Blogger, LiveJournal, TypePad, WordPress (and  
many others).

Writer supports RSD (Really Simple Discoverability), the Metaweblog  
API, and the Movable Type API.