Decided JFFS compression was stable enough for a proof-of-concept. It needs some cleanup and probably more compression algorithms before I can publicly release it, but dwmw2 and the Axis developers should have access to the source now.
JFFS is turning out to be rather interesting; it's far from a real filesystem but with some hackery that should change. It will probably never make sense to use it on hard discs, but it might make sense for ram disks at some point. It's also a convenient format for keeping a complete history of what happened to the fs, which I think might be a cool thing to union-mount over your source tree so you never risk losing changes.