USDA's Foreign Agricultural Service (FAS) regularly publishes a trade outlook report. The most recent can be found at the link above.
On page 5:
The fiscal 2010 export forecast for livestock, poultry, and dairy products is up $200 million to $19.9 billion, as strong gains in dairy outweigh moderate declines in poultry exports. The forecast for exports of dairy products is raised by 10 percent with U.S. prices more competitive as global prices have staged a dramatic recovery. Further, the recent decision by the EU to sharply curtail export subsidies has provided a significant boost to global dairy prices. Import demand is expected to expand slightly while competitor supplies—particularly from Oceania—will likely
be constrained by lower-than-expected production.
So now you can see why block cheese has fallen $0.22/lb in the past few days - or maybe not.