PivotViewer demo for photographers

I have a friend (Sandro Rizzetto) that is also a photographer. A good one, but his job is in IT.
For these reasons, after reading some posts of mines, he built a PivotViewer page to navigate its photo database. You can drilldown by category, date, lens, focal, iso, shutter speed and many other parameters.
The result is awesome and is visible here. If you are interested in technical details and comments about the meaning of the data, read his blog here (it is in Italian).