I would be going to.Germany only on this particular trip.
Had a quick look at one of the websites mentioned previously, and it looks like, depending which part of Germany I go to, would be ok with an Australian license.
It would only be a 3-4 week holiday, so I don't think I'm going to over stay.
In regards to earlier mentioned triangle and vests, it is also compolsery to carry a first aid kit in the boot.
If I start saving now, I might be able to afford it by the time the Australian tectonic plate meets up with the one Germany sits on, then I can drive there.
Thanks everyone for your input and knowledge, keep it coming, the more the better.