I just received an email from them. Has anyone heard of them? It was very vague, so I'm a little concerned.

I've heard of them and had a friend meet with them. I believe they've been discussed on the board. Why were you concerned? What were they vague about?

The email just said "You are wanted for an audition", no futher information was given. I responded to the email asking for more information, so we'll see what happens. I tried to search the boards, but didn't find anything.

I would research the opportunity, just like all opportunities, carefully. I agree--vague is not good when it comes to auditions! Although it's not always a red flag. You know the drill--don't pay anything in advance, don't go to unfamiliar audition sites alone etc.