I'm already using it to write all my posts for this blog. It has many improvements and features, so I recommend it. Amongst many others, one of them is also the support for blogger tags. You can download it from Windows Live writer website, but the link is misleading. Don't click on the big Download button, because it will lead you to the Live Betas web page.
To download Windows Live writer, click on the links in the left bar. Click here to go to Windows Live WriterClick here to go to the page and download Windows Live Writer beta 2