Wow. These guys are claiming they are gathering stats on most p2p user. What's intresting is they must have reverse engineered the kazaa stuff long before the open source community did. It also would seem that they are probably running Kazaa Supernodes in order to get this info, thus helping Kazaa users download stuff that the RIAA would rather they not. I bet they don't tell their customers that.
I don't think a company like this could exists if something like Overnet became more common place.