Today, USDA released its "Agricultural Prices" report, available at: http://usda.mannlib.cornell.edu/usda/current/AgriPric/AgriPric-09-29-2010.pdf
The "All Milk" price for September 2010 milk is $17.20 per hundredweight. On page 22 is the September 2010 parity equivalent of $41.90 per hundredweight. You may notice the parity price is quite a bit higher than generally occurred when it was in effect.
So, lets drop it back to that level and approximate production. What that would mean is that for September 2010 an additional $2,746,350,000 would have flowed into rural America.