Performancing for Firefox is an extension that lets you blog from right within your browser.
Nice points: post to multiple blogs, technorati tags, blog metrics. Less than nice point, for our blogs anyway: b2evolution’s api doesn’t work. 😦 Definitely worth a test anyway.
[update] Performancing is now ScribeFire, and I’m now using WordPress. 🙂
ScribeFire plays well with WordPress. I’ve used it a fair amount (as witnessed by the posts with the “powered by ScribeFire” blob at the end), and it does indeed make it much more convenient to blog about something that you come upon while surfing.