A few friends and I have been playing with IRC encryption courtesy of FiSH. This extremely simple program is a plugin for irssi, XChat, and mIRC and provides symmetric encryption for channels and asymmetric encryption for private messages.
While not really useful for open source project communication it might be useful to someone out there wishing to keep their communications private. I'll put these on my list of something I might want to package. Anyone else interested in this software?