You probably already know all this, but what you're doing sounds so important I'll add my 2 cents just in case.
CU-SeeMe is video-messaging. They can verify visually 100% exactly who is on the other end. No risk that they could be talking to a Fed agent who got their hands on password/encryption key/computer of the other bad guy. Not only peer-to-peer, but developed by Cornell University, fortress of free speech. Less possibility of snooping or or cooperating with U.S. Govt than there could be with NetMeeting, for example. Don't know if any of this is new to you, probably not ;-)
May I be on your ping list please? (I used to do some Internet investigative work and lecturing, I'd be very interested in this in articles about this issue.)