It's just a forum that mirrors the sections of Bitcointalk. So we have a number of people from Bitcointalk that registered on a forum that mimicks this one, so it probably won't last for long. Most of them probably registered just so they can take the username they use here.
A few also used usernames of trusted members here, for scamming purposes. Hopefully the forum won't last long.
I'm pretty sure that several trusted members have actually registered there. I suppose that any trade done with anyone who claims is a trusted member here should always have a signed message from them that proves their identity. I know that most escrows use pgp signed messages to prove their identity, and I think they will do the same on that forum as well.