As far as I know, there is no RUG in Adelaide. In fact as far as I know, I (Greg Frost) have the only RepRap in Adelaide. Tell me if I am wrong, or if you are interested in getting involved. For now, I've put my info on the RUG/Australia/Melbourne page as I was invited to by Scorpia.
As of september 2013 there are at least a few other Repraps in Adelaide though still no official RUG. I (Jack Morelli/jakjak444) built mine at the start of the year and have since printed a few sets of prusa i2 parts for people in Adelaide and country SA.