What is great about this controller is that it's Propeller-based and open-source. This means you can modify the existing code or develop your own code to make the Propeller Servo Controller do more and control more, or expand it with other Servo Controllers.
Get it here:
http://www.ic0nstrux.com/products/robotics/Propeller-Servo-Controller-USB
Propeller Servo Controller USB
The Propeller Servo Controller allows you to control up to 16 servos by sending serial commands from a microcontroller or PC via its USB connection.