ScribeFire

An easy-to-use blog editor lets you post to all of your blogs.
One of the most popular add-ons for Firefox is now available for Opera! ScribeFire is a full-featured blog editor that integrates with your browser and lets you easily post to all of your blogs.
You can post to blogs from Wordpress, Blogger, TypePad, Windows Live Spaces, Xanga, LiveJournal, or any other blog that supports the MetaWeblog or MovableType APIs.
You can edit and update existing posts. You can schedule posts for the future (if your blog allows that). You can delete posts. You can save drafts. You can tag and categorize.
ScribeFire for Opera has a simple interface that is so simple even a caveman could use it, and anything you're working on is saved if you close the editor and restored when you come back. It really is the easiest way to update your blog.