You know, Alyson just rocks, but I wish I knew of this last summer.... 

"It frequently comes up that you may want to show a date in your scorecard, either as an actual value, a target value or just as an extra piece of information such as when was this KPI last updated in the source. One way that you can display dates in your scorecard is to make use of the MDX "Properties" expression.  Note, that this will only work for data being sourced from an Analysis Services cube.  See the simplistic example below. "

more at source