As part of the VizWeek Discovery Exhibition, Microsoft Research has published a detailed document of the result of their “Heatmap” project which monitors and visualizes access to the Microsoft Virtual Earth system.
Randall Hand is a computer graphics programmer and news junky that's been working in the field for the last 15 years. He's responsible for visualizations generated on some of the most powerful supercomputers in the world, ytnef, mullion support in ParaView, and VizWorld.com.