See also Webopedia's "Did You Know... What's Inside a Hard Drive?"

Actuators - Provider of automated and manual valves. Categories include ball, butterfly, plug and integral (valve/actuator), as well as accessories.

Clippard: Actuators - Provides a line of miniature pneumatic products, including air cylinders, electronic and control valves, tubing, hoses, fittings, and modular valves.

Techna-Tool: Actuators - Supplies reliable tool monitoring systems to high production metal cutting manufacturers, including monitoring of actuators.

HardwareCentral
Resource site offering news and information about PC hardware elements. Includes timely feature articles and sections on optimization and troubleshooting.