Whining about idiots who deploy four-wheel drive vehicles in the suburbs is an Australian national hobby. If you do own a 4WD, you should want to take it off-road. 4×4 Earth lists 4WD tracks around the country, letting you find locations where your vehicle actually makes sense.
You can search for nearby locations by postcode, and see tracks ranked by difficulty. The site uses the Google Earth plugin to show 3D renderings of the tracks, or you can see a conventional roadmap version. Other features on the site include search facilities for camp sites, 4WD specialist mechanics and insurance policies.