I found a very help website TradingCharts.com this week.This became the only source I referred to in the past trading week because I found it highly user-friendly.What makes it unique is that on the main website of it there is a “Quick Quotes” column, in which we can select the commodities of our interests ( corns, soybeans and wheat). All price charts and news articles are popped out after selecting.

http://futures.tradingcharts.com/