THIS NOTE HAS BEEN LIQUIDATED - LAST TRADING DAY; September 9, 2009. The PowerShares DB Crude Oil Double Long ETN (TIcker: DXO) seeks investment results that correspond to TWICE (200%) the monthly performance of the Deutsche Bank Liquid Commodity Index - Optimum Yield Oil Excess Return Index. The index is a rules-based index composed of futures contracts on Light Sweet Crude Oil and is intended to reflect the performance of crude oil. Throughout the year the precise weighting of each commodity in the index will change based upon price changes. Selection of contracts is determined based on the best possible implied roll yield for each eligible futures contract. The fund company provides no information on contract weighting methods.