I thought I'd resurrect this thread, and try to get some new discussion going.
I had the pleasure of seeing this film in Copenhagen a few months ago. It is definately astounding--an exhausting near 3 hour ride through the depths of human failings
The performances are what make this film so powerful. Von Trier, in a style that is technically non-Dogma, yet extremely Dogma, strips the film of the visual distractions of sets and creates a unique, sterile stage environment that can be completely controlled (some may actually find this more distracting than acutal sets), and characters can be allowed to flourish. However, this choice becomes acceptable and invisible to the viewer when one gets into the story. A powerful, must see film when it hits the US in 2004.
I also got to be a fly on the wall during a casual meeting between Von Trier and some colleagues at the National Museum in Copenhagen. They were in a public eating area, discussing something in Danish, and looking at what appeared to be storyboards. I didn't get to meet him, but it was pretty neat to see.
BTW, the production design is not angular and abstract like Warm's designs in Caligari. There are fragments of buildings and furniture, but basically, design is minimal. It's simply a black stage with labels and outlines on the floor.