So, today I managed to blow up my server. Interestingly, the jails are still working- at least until a reboot. I was updating the main server, and had a failed installworld... actually the command I got was because installworld, for updating the jails, was failing. So, for everybody out there, never run this unless you are 100% sure you need to:

make -f Makefile.inc1 install

It overwrote my libc before failing... and all recovery methods have failed to date. So, I have a few options now. 1. Hope I never have a power outage, and keep everything running.
2. Boot from the recovery CD i just downloaded, and try an installworld from there. That should fix the bad install.
3. If that fails, and I have every cause to believe it will, it's time to reinstall the system. For that, I'll need some more harddrives.
I'm not going to try options 2 and 3 until I'm ready to spend all day with them. Hopefully we don't have a power outage.