Is Photographing in Public a Crime?

There appears to be a growing assumption here by some members of the public that people making photographs or video footage anywhere in public are somehow automatically committing a crime by doing so. To put it simply, no such crime is being committed. So please, vigilantes, cease your harassment. 

I have put up a reference page with links to a couple of useful pages and a downloadable document on relevant Australian law as well as notes on some surprisingly common vigilante harassment situations: