i am just about to buy this usb stepper motor controller
http://www.ar.com.au/~softmark/page44.html
three motors can be driven.
what jaycar stepper did you buy, i am in our capital city (hobart) for next few days and would love to be able to buy a stepper motor.
also i see that 7.5 degree stepper motors with gearing seem to be the go for computerizing the dob for tracking
i have linked to the maths for converting ra / dec to alt/az, your set up for the focuser looks great and
http://www.bbastrodesigns.com/ has been great for ideas for the two directions of movement for tracking.
i would love to be able to track and focus by end of october in time for snake valley!