He also outlines the process of scaling up from the 4 servo demo to 12 servos on a standard Arduino. Sounds like it might be time to build your own version of a mouse-controlled Lynxmotion arm ...

The High Power H-Bridge Motor Shield for Arduino is equipped with built-in current sensing utilizing the ACS712, and is capable of driving any DC motor up to 15Amp.

The ELCOM ST slotted brushless dc servo motors are capable of delivering a continuous torque of up to 49 oz.-in. with motor speeds up to 8,000 rpm and a power output up to 188W ...

Most hobby servos of this type are restricted to a certain range of motion (usually 180 degrees) because the position encoder is a simple potentiometer connected to the output shaft.

If you've messed with Arduino, the inexpensive micro controller, you'll know that you can run a small motor or turn an LED on and off, but anything else - powering a pump, turning on a light bulb ...