"Those who do not learn from history are doomed to repeat it" - George Santayana
"Past History is No Predictor of Future Performace" - most Wall Street investment literature.
In my life, I have tended to side with Santayana over the bankers. As a science fiction writer, I have absolutely lived by his quote; generally, history tends to repeat itself and probably will in the future.
But what if you could actually predict history, ala Hari Seldon? Check out the new Cliodynamics: Journal of Theoretical and Mathematical History, mentioned in this nifty article!
A must-read for SF writers, I think!