"Hot" data will always be dependent on the audience. For example, a backlog calculation would be a "hot" issue for a production team so they can understand the orders pending production and whether or not those items are material or labor constrained. This wouldn't necessarily be important to a marketing team. A sales team may be interested in salesman performance in their territories and potential risks to forecasted sales. I think a tiered method could be utilized, but if each functional group were to define their "hot" data required, much of the organization's data may be required to be stored on something like flash media. What are your thoughts?