As you have no doubt noticed, we changed out the non-configurable funnel for a more useful (Google Analytics-like) and changeable set of line graphs. You can alter the date range by setting it at the top right of the table and clicking Go. You can also displayed data by clicking the name of the metric (e.g. New Prospects).
In the future, we will enable drilling into the numbers to display the relevant set of prospects or opportunities.
I have attached a screen shot for an example.