SELinux Boot Issues
Problem: After recently shiffling partitions (and rerunning Grub from a boot CD), Linux system appears to boot normally. Everything boots to the X Window login screen. Attempting to log in with known good username and password starts to log in, then immediately kicks back to login prompt.
Exact symptoms of the issue got lost in my accidental Wiki wipe. Entries of some kind in /var/log/messages.
Solution: Reboot with restore/rescue CD, drop to shell, added "enforcing=0" to the end of the kernel boot parameters in /etc/grub.conf, reran Grub.