links

http://www.americanmafia.com/  

Ignore the cheesy ads. This is a terrific compendium of organized crime history.  

http://www.dmoz.org/Society/Crime/Organized_Crime/Mafia/  

An easily searchable resource for information about specific families.  

http://www.readwriteweb.com/enterprise/2009/07/the-digital-mafia-online-crime-gets-organized-says-cisco.php   

A 2009 report by Cisco Systems on the online presence of organized crime.