New York Mercantile Exchange  

http://www.nymex.com/

Chicago Mercantile Exchange

http://www.cmegroup.com/

Dubai Mercantile Exchange

http://www.dubaimerc.com/

Consulting

http://www.commodities-consulting.com/

Academics / Agro-commodities:

http://agebb.missouri.edu/mgt/risk/introfut.htm

Academics / Economics:

http://mises.org/

Research / Gold & Silver Trends 

http://www.goldsilvertrends.com/about.aspx

Research / Gold Standard  

http://www.answers.com/topic/gold-standard

Research / All Commodities  

http://www.crbtrader.com/

Research / Trends

http://www.fortucast.com/