Quote from atticus:
The best spread-trader I know uses ARFIMA for timing/forecasting. He booked ~10MM in gains in 2007 and seems to be doing even better in 2008. He trades Eurex FI and Euro equity index correlations.
I have another buddy who booked 5x on 6-figures trading volatility futures this year, but I am not privy to his model. His ROC beats anyone I know, but his book is a bit >1MM and his system doesn't scale much beyond 1-2MM.