Budget climb is a project I worked on for 3D Sensing and Visualization class, that we've also entered in the datavischallenge. I worked with Fred Truman and Frankie Cheung to build a cityscape-style representation of the US federal budget from the last 26 years, broken up by type of spending.
The cool thing about our project isn't the graphics, which are fairly basic, but instead, the interaction. In order to explore the data environment, we have to physically use our arms to climb, which gives us a real sense of the scale of each type of spending. Climbing military spending, especially for the Bush years, for instance, takes a lot of physical effort.
Source code, and binary (runnable) applications (both kinect and non-kinect flavors) available at budgetclimb.com.
Update: We made it to the finals in the DataVisChallenge and won $500. Which will almost certainly be spent on Bon Chon Chicken.