Maybe just combine these two?
Chatterbox links to Chatterlight, Chatterlight should link to Chatterlighter. As it is, Chatterlighter is impossible to find unless you know where to look. Chatterlight links to itself and that's just not very helpful.
Archive button for private messages where they appear in the Chatbox.
Sent Messages page. Would be nice to see what you've said without having to CC every time.
I'm currently working on stealing various people's CSS to make the sidebar more flexible. Hoping that the option to hide it is incorporated into the new layout I hear is in the works.