I have just seen this posted on another shooting forum.
http://www.polymythic.com/2009/01/ar...-target-range/
It uses the Arduino controller card again with a web interface so it can be controlled from an Iphone (Or any web connected PC)
I like the idea of a 5 target turning target system with the standard times programmed into it.
I think a larger Pololu servo unit with a few digital inputs to select the different timing routines and a start pushbutton along with 5 servos and some lightweight wire target holders could be a starting point.
Thanks
Mark