SMTnet Offers discussion forums, directories, technical information libraries, and equipment marketplace for electronics manufacturing industry. http://www.smtnet.com

PCB-Broker B2B marketplace for printed circuit boards. http://www.pcb-broker.com

PCB Design and Fabrication Provides price quotes for circuit board manufacturing; lists circuit board (PCB) and semiconductor companies, and includes general design guidelines for circuit boards. http://www.pcbdesignandfab.com/