Hi,
As my toucam is currently plugged into the parallel port for the long exposure stuff and 1 usb port for general avi capture, that leaves the three usb ports the only option for telescope control. Did a search and found
http://www.usbmicro.com/
There is a stepper motor set up
http://usbmicro.com/odn/documents/197.html
I will have a look at whats involved and get back to you all