Alacra, a provider of business information, has a wiki with free industry information organized by industries ranging from candy to mining. While anyone can post to this wiki and change or add information, there are valuable links to reputable organizations that might be difficult to find otherwise. For example, under coal, there are links to the World Energy Council and the United Nations's Division of Technology, Industry, and Economics.

Check it out at:

http://www.alacrawiki.com/index.php?title=Alacra_Industry_Spotlights