This is a pretty talented piece of data-collection scripting. It's one thing to have the auto-.dat collection script which logs every possible thing in the game, though from your installed files.
It's another to deliver any real-time stats for what's going on ingame by drawing on the server data. The closest thing I can think of is the Vana'diel calendar, but that can be generated without drawing info from the game servers.
It's a couple of days off of today, but damn! They even managed to harvest the minimum bidding prices people place on their items, which are invisible ingame. It's like a packet sniffer tool turned into website form for the AH.
Actually, that second part makes me uncomfortable.