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i am a partner of Philip Zimmermann and we recently created a new extension of ZRTP called ZRTP/S that let to do secure communication over 2G/3G CSD 9600bps communication!
In the upcoming weeks we will release the source code on zfoneproject.com website.
It would be *very nice* to start a project to make it working on OpenMoko, i am confident that there should be a lot of request of a fully opensource phone to be used for voice encryption.
Please contact me to firstname.lastname@example.org if you are interested in discussing/brainstorming the project!