Does anyone know who runs that site or how to contact them? The site itself has no contact info on it, the source code is owned by a user just called "brainwallet", the only thing resembling a contact address is a twitter account also called "brainwallet", etc.

I actually have IRC logs about the creation of the phrase brainwallet and brainwallet.org.  It was created by someone who introduction to the subject matter was his own efforts to crack peoples insecure keys, and he was irritated that he only found a few coins. No kidding.