I can't find the thread, but I remember a table that was posted on LSD that attempted to correlate IQ, LSAT, SAT, GRE, etc. My IQ(138), SAT (1310R-1994), and ACT (30-1994) results correlate relatively well. My LSAT did not, though that chart indicated a 163--not too far off from the 159 I achieved. Kev mentioned the choke and Lily mentioned lack of sleep--both of which may have been a factor in my LSAT results.
I think it's clear that some correlation exists. If I were to bet, I'd guess that combined score on the SAT (rather than either Q or V), ACT, and IQ all correlate with LSAT scores relatively well. What the coefficient is--none of us will likely ever know.
Edit: Now that I think about it, that chart may have had a higher score than a 163 listed on that "line" I seemed to fit otherwise. Can anybody find it?