The content of the Security Analogies wiki is now available here, under the GNU Free Documentation License 1.2.
Eliot Van Buskirk's How to Explain DRM to Your Dad contains a series of excellent examples to help explain DRM to people who aren't so tech-savvy.
Another source of information is the I Hate DRM web site.
The Right to Read, a story publiched in 'Communications of the ACM' and reproduced on gnu.org.