For his thesis, Sean Gorman made an interactive program to identify power, Internet, and phone networks throughout the U.S. On a map you can select any company and see exactly what network wires to snip where to disable it. You can also see how interdependent different companies are. The government has described it as "a cookbook of how to exploit the vulnerabilities of our nation's infrastructure." All of this information was obtained from public records.

...reminds me of the grad student many years ago that built his own atom bomb...