I’m really digging Performancing for Firefox. It’s an extension that pops up on the bottom half of the screen, and lets you write and publish a blog post without navigating away from the page you’re looking at. Very full featured, WYSIWYG editor or pure HTML, and let’s you drag and drop text, images, and links from the browser window. Like this:
(I just dragged and dropped that image. Nothing to it.)
The newest version even lets you insert Technorati tags easily. Very nice, and well on its way to earning a permanent home in my toolbox of Firefox extensions.