The Association for Progressive Communications has put together a briefing on information security for lefty organizations. My experience has been that these organizations are enthusiastic adopters of technology for their activist work, but they're totally clueless and/or uselessly paranoid about infosec. This briefing includes good notes on:
* Backing-up Information
* Passwords and Access Controls
* Using Encryption and Digital Signatures
* Computer Viruses
* Using the Internet Securely
* Living Under Surveillance