Will two branches also mean two separate CVS repositories so the three of us who run FS2_Open on Linux and thus compile CVS builds for ourselves can choose between stable and testing builds?
Yep, just grab a checkout as normal but with the tag "fs2_open_3_6_9" and you'll get the 3.6.9 stable branch.
I'm going to use that branch as the base for all of my upcoming code since I need something stable to run with. None of my new changes will hit that branch in CVS, they will go to the unstable branch instead, but it's going to be nice to finally have a stable base to develop on top of so I don't have to worry about broken builds and bugs that are outside of my own new code.

And like Goober said, there are more than 3 Linux users of FS2_Open. A LOT more.
