Forgot to mention, even though it mentions it in the link, this requires either Firefox or Chrome. IE and Safari both don't have the FileReader method needed to make it work.
Just to give you a few examples of what you can do, let's say you want to know what focal length or lens you use the most. Then you want to break that down and find out in each of those groups how many pictures you rated as 5 stars. Or perhaps what shutter speed you use at what focal length or what aperture you use the most. The possibilities are pretty broad since there are 11 properties I believe and so if I'm doing my math right it should be a total of 121 (11 x 11).
As I say on the site, none of your data gets uploaded to the server and if you want to test this load up the page. After it's fully loaded disable your wifi or lan connection and then refresh the page. Everything should still work. The only thing that ever sends an data is if you want to export the graph as this uses Highcharts server for creating the output file. Anyways take a look and see what you think.