This image shows data from a firewall log. It shows the connections between destination addresses and destination ports.
The script to generate the graph is written in Action Script (Flare). I hacked the sample Flare file: DependencyGraph.as to have it read CSV data, instead of some JSON formatted input. The script is a real hack at this point. If you want a copy, drop me a note. I will gladly share it. Here is the live graph.
Jason, thanks for all your help with the ActionScript stuff!