I have camped a couple of times on the free campground (Blackheath Glen Reserve) on Megalong Valley Road which some of the other guys mention.
It has always been pretty good. A pit toilet, two picnic shelters, tank water and a little creek.True, the road is very close to it, but there is virutally no traffic at night, so it has never bothered me.
It can get busy, but has never been too bad.
Link: http://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=blackheath,+nsw,+australia&sll=37.0625,-95.677068&sspn=33.489543,56.25&ie=UTF8&ll=-33.675519,150.268652&spn=0.017178,0.043774&z=15
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