This was a very productive week! Work is well underway on documentation for Firefox 5 (and, actually, for Firefox 6 as well). Instead of listing everything out, just look at Firefox 5 for developers and Firefox 6 for developers. I believe that covers everything I wrote this week. With the exception of one update to the documentation for nsIEditor, which Ehsan said not to make too big a deal out of. So we took it back off the Firefox 5 for developers page.
This coming week I plan to work on the CSS animations documentation. That should be an adventure!