D3 Interactive Visualization of the US Budget – 1976 through 2013 (solomonkahn.com)

All this animation seriously detracts from the value of the data collected. With the way things switch position and color, it's extremely tricky to compare one year to another, especially when they disappear for a brief interval.

What needs to happen is one year should shift into another without disappearing, the size of the boxes should change.