The Pololu serial 8-servo controller allows you to control up to eight RC servos with almost any robot controller or computer. Connect multiple units to the same serial line to control up to 128 servos independently.
Documentation and other information
Pololu Serial Transmitter utility for Windows (Printable PDF: pololu_serial_transmitter.pdf)
A simple serial transmitter utility for Windows that lets you transmit sequences of bytes at a selectable baud rate to a selectable COM port. This program can be conveniently used to send commands to our serially controllable devices.