You can browse the maize genome or even download the data yourself:
I have multiple copies of this data on my hard drive now.
You can also check out the Idiot's guide to corn at
Much of what we know about plant genetics and breeding is due to what we learned from corn. The corn genome is not just cool, but a fundamental model system. It provides insights into the genomes for the cereal plants that contribute most of the calories you eat every day.