This page contains a growing list of general extortion handling related resources.

Hobbs Act—Extortion By Force, Violence, or Fear

http://www.justice.gov/usao/eousa/foia_reading_room/usam/title9/crm02403.htm

Vexatious litigation (Wikipedia article)

http://en.wikipedia.org/wiki/Vexatious_litigation

What to do when you are receiving harmful threats from scammers by phone or email

http://www.fraudaid.com/threats.htm

The FBI's Alert Regarding "Sextortion": Why Cyber Blackmail, Though Illegal, Is Difficult to Stop and What Computer Users Can Do

http://writ.news.findlaw.com/ramasastry/20101130.html

Negotiating with Extortionist Government Functionaries Part 2: Legal, Logical Moral and Emotional Barriers

http://www.negotiatormagazine.com/article399_1.html