Firefox only: ScribeFire, formerly Performancing for Firefox, lets you compose and publish blog posts directly from your browser.
Like its predecessor, ScribeFire opens a split panel that provides a full set of text-editing tools, complete with rich/source editing tabs, a live preview, a post history and more. You can easily drag and drop text, images and links to the ScribeFire pane, making it super-easy to reference other sites and info within your blog entries. The latest version, 1.4, promises improved support for Blogger accounts and better file uploading. It also supports the new WordPress API.
In addition to Blogger and WordPress, ScribeFire works with Jeeran, LiveJournal, TypePad and Windows Live Spaces. This killer extension costs nothing; it requires Firefox 1.5 or later.
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