Although the commodities bandwagon is picking up speed it does not mean that a bubble is forming. The fundamentals are that the world population is growing and the many commodities are not. Supply and demand will ultimately determine the price of commodities not the number of speculators on a specific etf. I understand that leveraged etfs like UNG and DXO took a licking because the way they were structured. The best way to invest in commodities is to buy futures. But for the average Joe, myself included, an etf like DBC is the most sensible way to invest in that bandwagon. Limit your exposure to a percentage you are comfortable with.