Among them:
- Unpredictability: being unpredictable is a very strong security mechanism
- Hushmail: using web-based strongly encrypted email should be standard
- Tor: Tor should run on most organizer computers
- Storage: Find someone to host, ideally privately, an SSH box for you and connect to it using tools such as MacFUSE/SSHFS
- Disk Encryption: Create an encrypted disk image and an encrypted disk image inside the mother image
- External Devices: If you have an external device, encrypt it...and if you can, give it to someone you trust such as an attorney or clergy person who is less susceptible to search than your average organizer.
I'm going to revisit some of these in greater depth in q2 2011 and publish the TWM Training.
For more information, the Electronic Frontier Foundation has a great primer here: