I've been doing a bunch of architecture work at Songbird for the past month or two. A large part of that has been digging around in mozilla source and asking questions in #developers to find out if certain things are possible and how to do them. I've been focusing on browser related stuff and in particular I've been looking at adding tabbed browsing to Songbird and adding an API for website to use that will give access to songbird controls (Yeah, I know security issue!!! ).
We're going to be posting all the docs we wrote on our website very soon so I won't get into the details of our plans here. But I will be writing some posts that detail some of the interesting things I've learned and discovered. I just feel that part of being in the mozilla community is contributing to the documentation as I go. If I get enough stuff on any particular section that it makes sense to move it over to one of the mozilla wikis I'll, of course, do that.