Cool extension for Firefox! Performancing for Firefox lets you easily post to your blog from FF in a split window. The tabbed layout includes a rich editor, source editor, and preview. Common text formatting functions are available from the toolbar, and more advanced features like categories, history (recent posts), and notes (you can use these as drafts) are available in a sidebar. Technorati tags can be easily added. Support for Blogger, TypePad, WordPress, LiveJournal, MSN Spaces, and Custom for everything else. Looks like you can drag-and-drop images from a web page directly to a post!
Link via: Scoble