Download the cd from stepperworld, interface.doc gives you the pin assignments, connect the arduino to the parallel socket and you should be able to drive this thing easily enough. Parallel ports used TTL voltage levels, as do all arduino's before the Due, so there won't be any problems there. You should be able to use any modern reprap firmware with appropriate modifications to the pin assignments.
EDIT] Thats what I get for posting while eating.
EDIT] Thats what I get for posting while eating.