I got my OC back... I reset the CMOS (jumper) (taking pics of all my settings 1st) and replaced the CMOS battery (even tho it showed a proper voltage).

Currently running with
CPU 11.5x (2.875 GHz)
CPU Host clock enabled
CPU Host freq 250
PCI freq 100
SPD 2.66
Sys Volt Auto

If I understand what I'm doing (and that's not a given) this puts memory at its default freq, but changes the base freq so there is more upside for the CPU multiplier. In theory it could go up to 3.125 GHz (with 12.5X). I'll run with 2.875 for now and verify that it sticks for a while.

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GA-G31M-ES2L.v1, E6300 @ 2.8GHz, nvidia GT240 (or 9500GT), 10.6.6, fakeSMC rev454