Learn more
http://www.hamra.net/fun/bcc.htm
http://www.cs.rutgers.edu/~watrous/bcc-for-privacy.html
Wikipedia - Blind Carbon Copy
About.com How to send e-mail to undisclosed
recipients
Sins of the internet - Not using bcc
Bandwidth Hogs: Exposed Addresses
National Cyber Alert System - Benefits of
Bcc - US Cert