The price just popped above some key moving average levels and looks like it could make a run towards $4.50 a bushel, based on the July 2009 futures contract.
Corn trades on the Chicago Board of Trade (CBOT) and if you want to take advantage of any bullish moves, the best ways to do it is with limited-risk futures options contracts - either using outright call option purchases or bull call option spreads.
In Mexico there will be less corn production because of the free trade, but there will be more consumption with the population growing fast, therefore Mexico will have to import a lot more corn, at very high transportation costs.