Link analysis, terrorism, and 'Hamlet'

Since 9/11, lots of
hard work has been done on "link analysis" -- looking at who communicates with
whom, who sends money to whom, and so on, as a way of detecting and delineating
terrorist networks, nodes and points of vulnerability. David Ignatius makes
this fact a key to his new novel, Bloodmoney.  

Now a Stanford
professor of English is doing link analysis in literature. To my surprise, he
is coming up with some
interesting stuff on Hamlet:

" ... of all the characters who speak to both Hamlet and
Claudius, only two manage to survive the play (Moretti calls this part of the
network the "region of death"). Or one notices that Rosencrantz and
Guildenstern, the most famous pair of minor characters in all of Shakespeare,
never speak to each other."