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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.
Blogging has turned the web into a two-way communications medium. Our goal in creating Writer is to help make blogging more powerful, intuitive, and fun for everyone.
Writer has lots of features which we hope make for a better blogging experience.
from http://www.edbott.com/weblog/?p=1433