I'll be at FOCS in Las Vegas. Others from here might be there too. Is there anything we can do to help promote the site ? A meetup ? booth with big cstheory sign :).
How about trying to get current site users together for a photo? Preferably in the FOCS hallway during one of the small breaks, so that lots of people see a big photo and wonder what it's about. Also, then we have a big photo we can post...somewhere...
Or maybe even hold up a big sign in the photo that says "cstheory.stackexchange.com", and then people won't have to wonder.
It will probably help to try and include some of the big names on the site.