I made an interface for controlling rc servos with pc via rs232 serial port. Had to build quickly something to test it with :)

The interface is a suitably programmed simple avr attiny2313 microcontroller. It is able to control up to 13 servos in parallel, or more with just a bit tweaked software a controller with more i/o pins.

http://sooda.dy.fi/viritykset/so/ (in Finnish) (less info)