Just found this new Visualization technique called “Time Radar Trees” for displaying weighted dynamic compund digraphs.

The TimeRadarTrees approach shows the information hierarchy as a traditional node-link diagram, but in a radial style. Each graph is represented as a slice on the inner circle and corresponding slices on the smaller outer circles, which we call thumbnails. The inner circle shows the incoming edges, the thumbnails represent the outgoing edges. Many interaction features as well as smooth animation help the user to explore a given data set. Filter functions as well as detail-on-demand per mouse tooltips are also integrated.

via TimeRadarTrees :: TimeLineTrees.