Adobe you are so far behind the game to your competitors with year over year reporting. How hard is it to show two datasets in one trend/report? This should be in all programs; sitecat, ad hoc, analysis workspace. From the basic metric of visits 2015 versus visits 2014; one snapshot, one graph, two trend lines. It is easy to look at and compare vs the painful download one chunk of data, now download the next chunk of data and graph yourself in excel. (Google Analytics and Coremetrics can do this and have been able to for years)
This should really apply to all time frames! Select your time frame A and time frame B and compare. Whether its week over week, month over month, year over year.