I use Windows Live Writer to author most of my blogposts. It is so darned convenient. I type in a very very Wysiwyg fashion, it makes blogging so much easier, and so much fun. My site, runs on a blog engine, I have written (modified Shanku Niyogi's blog starter kit). Incorporating Windows Live Writer was a peice of cake - I highly recommend you do it too.
I just posted a blogpost on WPF DataBinding, here is how it looked, right before I hit "Publish".
Now, Live writer is still beta, and there are still a few imperfections, but I really really hope MSFT works on 'em and fixes 'em out.