For this week, I just found this useful website for sharing:

http://www.fao.org/worldfoodsituation/wfs-home/csdb/en/

This website is build by Food and Agriculture Organization of United Nations. The Cereal Supply and Demand Brief provides an up-to-date perspective of the world cereal market. The monthly brief is supplemented by a detailed assessment of cereal production as well as supply and demand conditions by country/region in the quarterly Crop Prospects and Food Situation.More in-depth analyses of world markets for cereals, as well as other major food commodities can be found here.

Paying attention to the Monthly release dates for 2012: 08 November, 06 December.