The PhidgetMotorControl HC allows you to control the angular velocity and acceleration of up to two high–current DC motors. It provides a generic, convenient way to interface your PC with DC motors and other Phidgets devices.

Datasheets
Technical Information / Manual (.pdf 437 Kb)
COM API Manual - Windows (.pdf 487 Kb)
C API Manual-Windows/MacOSX/Linux (.pdf 338 Kb)
Action Script API Manual (.pdf 470 Kb)
.Net API Manual (.pdf 579 Kb)
Java Docs (.zip 181 kb)

More information can be found on Phidgets website & fourum