There is a new Blog Editor called Performancing available as Firefox Extension.
Performancing for Firefox is a full featured blog editor that sits right in your Firefox browse and lets you post to your blog easiy. You can drag and drop formatted text from the page you happen to be browsing, and take notes as well as post to your blog.
This is what it looks like:
It also offers some del.icio.us integration. The UI has still some usability issues, but generally Performancing seems to be a slick little add-on for Firefox.