It's also relevant to understand how we got here, a read a little history to avoid repeating it. An oldie but goodie: The Hacker Crackdown by Bruce Sterling http://www.mit.edu/hacker/hacker.html

The book is about the incident where the Feds first raised the legal issue of reading anyone's email without a warrant, and in a way it became the war that launched a thousand Internet legal advocacy organizations; which is where we are right now.