How much reporting does an IT organisation really need?

From your experiences in implementing practices such as ITIL, CMMi, Balance Scorecards etc. how much reporting/measuring have you found is enough? Obviously this may differ depending on whether you are aiming for CMMi level 3 or 5 and the business you are in, but what has worked for you? Simple database extracts managed in Excel and/or Business Objects or externally supplied reporting products? Any interesting (or amusing) experiences or lessons? We have adopted all of the above practices and the benefits are clear and not in question but as we mature how do we improve in this area without ending up reporting for reportings sake.

Cheers.