There are a lot of resources on the web that describe social engineering to gain access to computer systems for profit. This blog is focused on how it is advancing and going beyond the present electronic frontier. For resources on Social Engineering Prevention for computer networks:
Good reference sites for protecting your electronic frontier:
About.com - Antivirus Software
Answers.com Social Engineering
McAfee's "The Origins of Social Engineering"
There are a lot more sites to google as well. Just be careful, some may be hacker sites.