Pev's SMUs are better than mine, though they were built off my model. alby6 has some QR EMUs that are worth looking at.
I believe that someone has Melbourne's Connex EMUs. I have seen quite a few screen shots of them in the Australian Screenshots thread.
NSW, has the Millennium set, the double decker S set and another CityRail set, but I cannot remember which one. I'm not certain if the Tangara has been modelled, but I do remember hearing someone mention wanting to model it a few years ago.
I'm not too sure about EMUs for the other states.
Chris