You've been clamoring for it, and now the Alloy of Law ARC Discussion board is finally here, as a subforum in the Mistborn boards. I've tried to add everyone who I know explicitly has an ARC, but I'm sure I missed some. If you have an ARC and you would like into the board, please post saying so or PM me. (And if you don't have an ARC, I sure hope you like spoilers, I guess.)
But if you don't have an ARC, don't worry. As soon as the book comes out, I'll move those posts to the regular Mistborn board, with spoiler tags, of course.