dbltree, I agree that trying new things is fun. It is just my opinion that this really has more negatives than positives. There always has to be a nay sayer. If you have limited acres, I wouldn't take the chance of having a crop failure; by increasing the stress on the corn plants from the interseeded beans. I don't believe that you are going to increase forage/acre by doing this. Also, as I mentioned before why fix something that isn't broke. Maybe a person with limited acres should look more at an perenial forage than at corn and beans.
In the case of the 160 bushel/acre corn; just think how much longer that corn would have lasted if it were 200 bushel corn instead of 160. A little bit of N goes a long ways. What did the beans yield?
I don't plant a whole lot of food plots, 6 acres. I would rather leave around half stricly to corn and the other half to beans and perennials. You can replant the beans throughout the growing season if you want to keep forage available. I don't hunt over my food plots, I really put them there to keep deer around in the winter for shed hunting. Corn is key!