Graphviz - data visualization

I had a problem to follow a logic in someones programming and I had to deliver... I had to come up with a solution to push the brick forward. I started to look for a visualization tool for my problem. And to my surprise I found a graphviz - a tool for data visualization.

After some time I was able to come up with this:

Graphviz in action

I created a script in python which crated input file (from data in a db) for graphviz which created the image above. This allowed me to see the data relationships and move forward with the project. I later created an PHP implementation to generate the graph in SVG and include it among management tools in our intranet.