Finally, something I've wanted for a long time from MS...a blog post writer thingy. However, I like other people wanted this functionality added to OneNote since you can consider (at least I do), your blog as an online version of your OneNote thoughts. Scott Hanselman has a great post on his thoughts on Live Writer; in particular on how it behaves/interacts with dasBlog. I do agree with him that this writer seems/feels very familiar as BlogJet (an editor that I decided to purchase). Some of the layout of the editor has a certain feel to OneNote (like the right panel and the way you enter the post's title).
My verdict? It's a usable product. Does it have bugs? Yep...but it's beta. Hopefully these get addressed on the next releases. My biggest excitement about this product is the API it has...something that I always find rather cool. Your thoughts?