Below is a list of helpful links and valuable resources in the wire and cable industry.

Copper:

http://www.copper.org/ - Information on all parts of the copper industry.
http://www.metalprices.com/ - Prices for copper and other metals.
http://www.kitcometals.com/ - Copper comex prices and other commodities in real time. 

Marketing Groups:

http://www.equity.org/ - Nationwide group of independent electrical distributors.
http://www.imarkgroup.com/ - Marketing group made up of 172 independently owned electrical distributors.
http://www.adhq.com/ - Affiliated Distributors wholesale buying and marketing group in North America.

Directories:

http://www.theelectricalresource.com - The Electrical Resource is an electrical construction, maintenance and operation resource featuring directory lists of suppliers and manufacturers of electrical goods and services.

Magazines:

http://www.electricalnews.com/ - Electrical news magazine covering the western USA.
http://www.tedmag.com/ - Magazine for the electrical distributor. 
http://www.ecmweb.com/ - Magazine for the electrical contractor.

Organizations/Associations:

http://www.msha.gov/ - Mine Safety Health and Health Administration.
http://www.nfpa.org/ - National Fire Protection Association.
http://www.naed.org/ - For electrical distributors and manufacturers that sell through the wholesale channel.
http://www.ul.com/ - Underwriters Laboratories, trusted source for product compliance.
http://www.osha.gov/ - Occupational Safety and Health Administration.
http://www.necanet.org/ - National Electrical Contractors Association.
http://www.csa.ca/ - Canadian Standards Association.

Technical:

http://www.metric-conversions.org/ - Metric conversion website.
http://www.astm.org/ - Provides technical standards to industry worldwide.