What's behind the Meltdown in the Commodity markets?

"A Trend in Motion will stay in motion, until some major outside force knocks it off its course." After climbing to a 25-year high of 365.45 on May 11th, the Reuters Jefferies Commodities (CRB) Index began to show signs of fatigue in June and July, and then stumbled into a free-fall in August and September. With the CRB index slicing below its four-year upward sloping trend-line in early September, chart watchers would probably agree that a peak in the bullish cycle has been reached.