I'd like to split the Chatterbox in two nodelets: Chatterbox and Messages (maybe there are better names). In this way, one can put his Message Inbox where he wants, no matter where the Chatterbox is.

Since I'm talking about this kind of things, I'd also like a User setting that allows one to use the checkboxes near the private messages to mark them for archiving, instead of deleting. Do you think it could be useful?