WSJ.com - How Giant Bets on Natural Gas Sank Brash Hedge-Fund Trader

"Of all the traders gambling big sums on energy, a 32-year-old Canadian named Brian Hunter made some of the brashest bets and the fastest money.
Last week, he fell hard, proof of how quickly fortunes can reverse in gyrating commodities markets.
Here in this bustling new energy frontier, Mr. Hunter headed the energy desk for a Connecticut hedge fund called Amaranth Advisors. At the end of August, trading natural gas, he was up approximately $2 billion for the year. Then Mr. Hunter lost roughly $5 billion, in about a week."