Turns out that if you update the kernel with an external USB disk plugged in, grub gets hosed. When I originally did the system yum update I had a disk plugged in, that broke it the first time. I still had that external disk plugged in for each attempt at rescue/grub2 reinstall. Finally it dawned on me to try it without the external disk, and booting from the install cd, rescue mode, and reinstalling grub fixed it all.
Weird bug.
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