After reading the lifehacker desktop blog editor comparison I decided to give performancing for Firefox a try. I am a happy user of Ecto (number three in the comparison), but the performancing editor has WYSIWYG functionality, as well as Technorati and del.icio.us integration.
So I installed the plugin, and am now writing the first post in my new editor. So far I like it. It is easy to use, and it has more than enough functionality.