It seems that they would have a regular and inverse ETF for each of the major commodities so people could trade them without the risk of entering the highly leveraged commodity market.
Corn is near an historic low and is beginning it's seasonal move up. The commercials are also long. It seems to be holding support just above 3.50 with bullish divergence on the MACD histogram. If it breaks it's upper trend line and gets back above $4, then retests it, it sure looks like an attractive long term move.