Re: Australian Marina's that allow liveaboard
Generally speaking live aboard for greater than (I think) 21 days in any three month period is illegal in NSW. Certainly it is illegal to liveaboard permanently except under very specific circumstances and a yacht is not going to comply.
However ... if you are in transit then you are, practically speaking OK, provided you adhere to a few unwritten rules .... don't pollute, don't hang washing from the rigging or life lines, don't in fact do anything to piss off the NSW Maritime lads and ladesses who are in the main good people.
Liveaboards in a marina berth where the marina has on shore shower/toilet facilities are more tolerated than on a mooring if only because their is not real risk of pollution. There are a number of such places around Sydney Harbour but finding a vacancy may be the most difficult issue.
The question is really what do you mean by liveaboard ? If you are thinking to pull into a marina in any large city on the east coast of Oz and use your boat as a floating apartment then you are going to have problems unless you can do that in a very low key manner. If on the other you are simply passing through , even staying afew months, then you are probably going to be OK.
"Do you think God gets stoned? I think so... Look at the platypus." Robin Williams.