Cool Census Data App From ESRI Applications Prototype Lab

Here's a cool Silverlight app from the ESRI folks that like to live on the cutting edge. I really like the idea of using the physics engine to reposition the graphics. Obviously the app needs refining (what's with the tool bar on the left that looks disabled until you hover?), but the concept is cool. You can check out their related blog post here, or go right to the app to try it out yourself.