Gas Powered just dropped the mighty Siege Editor, the tools to let you poke and prod DS. I don't know if it's exactly the same as what they used, but it looks a hell of a lot like what I saw there.
Speaking of toolsets: I know I talk about it all the time, but you get a beta of the one for Neverwinter Nights when you preorder it. Okay, I'm done.
(CW)TB