He also has an Italian web site (his email on the American site points to it): http://eonsrl.com, but this site has been "under construction" at least since February 2010.
None of this indicates fraud, but it does indicate that this is a much smaller operation than everyone seems to be assuming (to your point).
It's Rossi's significant history of racketeering and fraud (described HERE that makes me think this is just another scam.
Rossi has picked several associates who seem to be suckers for other scams. Sterling D. Allan, in particular, has eagerly supported every crazy and fraudulent "inventor" that has come out of the woodwork. Things like cars being fueled by ordinary water and electric cars that recharge themselves.
Allan set up the first version of Rossi's "ecat.com" site (the one that promised that customers could put their money in escrow until they were satisfied. I believe that Rossi's current web site has removed this guarantee, but his fans are still quoting it as though it's a current part of Rossi's "pitch".
Also, Rossi's European partner, in addition to selling the E-Cat, is also selling a "genuine" perpetual motion machine. They claim that once you spin it up to its operating speed, it will continue turning at that speed forever, generating Megawatts of electricity while it spins. LINK
While Rossi's claims are at least somewhat credible (although you do have to throw away some existing nuclear physics laws to make it work), perpetual motion machines using magnets (as described by Rossi's partner) are obviously impossible.
The fact that Rossi seems to be attracting such nuts and con men doesn't speak well of his own invention.