One feature that is really necessary for an office is the ability to create quick notes ("sticky notes") and then elaborate on them later by typing up quick memos to log a phone call or meeting summary.
There currently isn't an "activity tracker" like many CRM's which I think is actually <i>better</i> because messages + tags work just as well and are much simpler (anything more complicated you can just upload a document).
Anyway, my point is:
it would be nice to have a "quick message" button somewhere, maybe in the workspace toolbar next to "refresh". It would bring up a "new message" dialog w/ the current selected workspace pre-selected. You could then add some tags (phone call, meeting, note, etc). If a follow-up is needed (due to a rush) you just flag as "important" (which, by the way, I don't see the "important messages" section in the workspace menu
).
How does this sound to people?