I don’t usually write about this type of thing on this site, but a good portion of my non-art attention is devoted to civil liberties, online privacy, open-source technology, etc. Whether your a geek or a privacy nut or none of the above, the Electronic Frontier Foundation is a group you should know and support:

From the Internet to the iPod, technologies of freedom are transforming our society and empowering us as speakers, citizens, creators, and consumers. These technologies are increasingly under attack, and the Electronic Frontier Foundation (EFF) is the first line of defense, protecting our civil liberties in the networked world. EFF broke new ground when it was founded in 1990—well before the Internet was on most people’s radar—and continues to confront cutting-edge issues defending free speech, privacy, innovation, and consumer rights today. From the beginning, EFF has championed the public interest in every critical battle affecting digital rights.

The EFF has fought the good fight on behalf of Indymedia, file sharers, and whistle-blowers, and against restrictive copyright laws, censorship, and the Patriot Act.
The EFF is currently campaigning to protect the online speech rights for online writers. They also have an invaluable guide on how bloggers can protect their anonymity online. With the police ramping up arrests and surveillance of graffiti artists, staying anonymous and free is about more than just having a good look-out.