This announcement was in a different thread here, but SG suggested I put it here for easy find.
I built a "Blog This!" bookmarklet for Mozilla.
Details can be found here.
When clicked, it captures the title of the page and the url. A blog form pops up (ala modified b2sidebar.php) with the subject pre-filled with the page title, a link pre-built into the post content, and the trackback prefilled with the url. It was something I used a lot with Blogger... that way if I'm on a page and want to pop in an entry about it, I can just hit the bookmark, and BLAM! start typing.