Today, Windows Live Writer Beta 2 became available. Beta 1 was released in Fall 2006, so this release was long awaited. Major changes to the interface and APIs make this a definite “must download” for the serious blogger.
Windows Live writer supports a number of different blogging engines including MSN Spaces, WordPress, and Blogger.
You can download it here: http://windowslivewriter.spaces.live.com/.
My favorite feature? Being able to add new categories on the fly.