Syed Reza Ali used Processing to build an interactive data visualization of the books checked out from the Seattle Public Library.
The project uses one year of transaction data (books, DVDs, etc) from the Seattle Public Library to drive the visualization. Each particle/sphere is given properties, such as what category/subcategory it represents and how many items where checked out in that category. This is used to drive the physics system that is used to separate the nodes evenly on the surface of the sphere.
You can play with it on his website.
better in person!! reza is amazing!!