Finding manufacturers.
GlobalSpec.com
TREM-Thomas Register
Electrical engineering hot links
Electronics Companies - UK and Ireland
Informationsystem Elektrotechnik Elektronik (German site, but links world wide)
Applegate Directory (UK & Ireland)
Mectronic.Net
Powertransmission.com
TechSavvy.com
The Green Book
WEBZERO: Industrial Directory of Engineering Products and Services
Le premier Moteur de Réponses de l'Internet Professionnel
TECHNOLOGY AND ENGINEERING SCIENCES