Pennwell Publications
A wide variety of periodicals and books, including many concerning electrical maintenance and manufacturing.
http://www.cablingbusiness.com/
http://www.electrician-guide.com
http://www.electronicstalk.com/
http://www.superconductorweek.com/
http://www.topix.net/business/electronics
http://www.worldservo.com/html/arc.htm