Today’s New York Times uses a network diagram to show the alleged flow if insider information between hedge fund managers and corporate executives.

http://www.nytimes.com/interactive/2010/04/01/business/01galleon.html

It will be interesting to see how this case plays out.  The size and complexity of the network suggests that there is more than just information exchange taking place.  In particular, it will be interesting to see if there is what might be called “information laundering” in which tips are embedded in apparently legitimate communications using dyad-specific codes.  Stay tuned!