Catch trends as they are happening. This analytic goes beyond straight comparison, it also accounts for period-wide volume. Often referred to as a what's changed report.

Name: google analytics compare ANY dimension period to period to see whats hot whats not.xlsx.xlsx 
Subject: widget 
Keywords: Compare period to period and immediately know what's rising and falling. Works for ANY dimension.

This widget is available for Excel 2007 and above and is refreshed with Next Analytics.