I think it would be useful to have a few more nobles who provide more general 'overall fortress reports', accessible through one of the menus, that contain a few bits of information useful to players in keeping their fortress running smoothly. For instance, these reports could contain:
* Rankings on the top sources of unhappiness in the fortress.
* Stats on the jobs that have taken up the most dwarf-hours of work.
* An estimation of the dwarf-hours spent eating, drinking, sleeping, etc.
* An estimation of the dwarf-hours spent walking to and from jobs.
* Stats which jobs have spent the most time waiting for a dwarf to start them.
* A description of how much food was eaten and produced in the past few months, with net change (this perhaps belongs in the stocks screen. Actually, net change over the past season could be helpful everything in the stocks screen.)
* Rankings on the top sources of overall fortress value, by item type.
If anyone can think of anything else that it would be useful to know, go ahead and list it. The 'top source of unhappiness' and the estimations of where your dwarf-hours are going seem like the most important to me... it's often very hard to determine those things right now, and knowing them is pretty important to keeping your fortress productive and happy. I can't imagine it would be that hard to collect the information automatically and have a noble report it, either.